Frequently asked questions about the products
Do NOT use ONEflow in the following cases:
With implanted electrical devices (such as pacemakers)
If large metal implants are present in the area of pain. A copper IUD is not a problem!
If you are using an insulin pump
If you have a high fever (e.g., > 38°C)
If you have known or acute cardiac arrhythmias or other disturbances of electrical impulse formation and conduction in the heart.
Contraindications include seizure disorders (e.g., epilepsy)
Pregnant women
Pre-existing cancers
After surgeries where increased muscle contractions could interfere with the healing process
Near the heart. Stimulation electrodes must not be applied to any part of the anterior chest (defined by the ribs and sternum), especially not to the pectoralis major muscles. This can increase the risk of ventricular fibrillation and lead to cardiac arrest.
On the bony skull, in the area of the mouth, throat, or larynx
In the neck/carotid artery area
In the genital area
On acutely or chronically diseased (injured or inflamed) skin (e.g., in cases of painful and painless inflammation, redness, rashes (e.g., allergies), burns, bruises, swelling, and open wounds as well as wounds in the healing process, and on surgical scars that are healing)
Using ONEflow does not replace medical consultation and treatment. Therefore, always consult your doctor first in the case of any kind of pain or illness!
No, the use of ONEflow during pregnancy is strictly prohibited. If you are pregnant or suspect you may be pregnant, you should consult your gynecologist before using ONEflow.
Definitely! ONEflow is designed to relieve primary menstrual pain (dysmenorrhea). But it can also help relieve the pain of secondary menstrual pain due to conditions such as endometriosis, fibroids, PCOS, adenomyosis, or pelvic inflammatory disease.
Everyone's pain perception and tolerance are different. Therefore, we can't say with 100% certainty that it will completely stop the pain for everyone. BUT it is extremely effective in treating and reducing pain. In most cases, the pain relief is so significant that it feels like you've flipped the 'off' switch for your cramps.
Absolutely! The design and shape were specifically developed so you can wear them anywhere – especially outside your home. The Drop Pads are the perfect on-the-go solution. Just please don't wear them while swimming or showering, and avoid all contact with water.
Many of our customers use ONEflow while they sleep. It's not harmful. However, for safety reasons, we advise against it, as it could detach during sleep and get onto areas like your neck or face.
ONEflow is specifically designed to relieve period pain – as are the pads, which are perfectly shaped for your lower abdomen and back. The good news, however, is that TENS devices have been used in physiotherapy for many years to relieve other types of pain – especially muscular pain and thus muscle relaxation. IMPORTANT: This should always be done in consultation with a gynecologist.
Yes, you can wear ONEflow while exercising. The device is small and discreet and can easily be worn under your clothes. It was designed for an active lifestyle, so you can relieve menstrual pain during your workout. Just not while swimming!
No, for safety reasons, ONEflow cannot be used while charging. Please wait until the device is fully charged before using it.
Pain varies greatly and isn't a one-size-fits-all experience – but ONEflow aims to be just that – a one-size-fits-all solution for every body. The technology works by stimulating something we all have: dermatomes on our skin. ONEflow's electrode pads are designed to move comfortably and adapt flexibly to all body shapes. The different pads allow you to freely choose what works best for your body. Additionally, our pads have the largest possible contact area for maximum pain relief.
We can only change orders that have not yet been processed for shipment. Once your order has the status "Preparing for shipment," "Shipping," or "Delivered," we unfortunately cannot make any changes to your order.
To make changes to your order, please send us an email to support@menstruflow.de or fill out the following contact form .
Yes, your order will be shipped with a tracking number. You can find this in our confirmation email and track your order using the following link: Online shipment tracking
We apologize for the inconvenience! To proceed, please check if your payment has been processed and if you have waited at least 5 business days. We have no control over delivery delays caused by our shipping provider, which can sometimes lead to longer delivery times. Afterward, please track your order online using the following link. Is your order perhaps being held by a neighbor or at a branch?
If you still can't find your order, please send us an email to support@menstruflow.de or fill out the following contact form .
Since we envision a world where all women and other menstruating people can continue their daily lives without restrictions during their period or in cases of endometriosis, we naturally currently deliver within the EU.
We offer the following payment options:
Visa
MasterCard
American Express
maestro
UnionPay
ShopPay by Shopify (Express Checkout)
Apple Pay
Google Pay
PayPal
Domestic delivery within Germany is free for orders over €70. For orders above that amount, we charge a flat rate of €3.95 per order.
For international deliveries, individual prices are calculated, and we only deliver within the EU: Zone 1: €7.20 / Zone 2: €7.95 / Zone 3: €8.60, and free shipping on orders over €145.00. Details about the zones can be found here: Shipping
Once you have placed your order, we will send you a confirmation email to track its status. Once your order has been shipped, we will send you another email to confirm the estimated delivery date and provide a tracking link (if the shipping method allows).
We pack your order within 24 hours on weekdays. It is then handed over to DHL and shipped via standard mail. This means your order receives a tracking number, is insured, and delivery takes approximately 2-3 business days.
You can check the shipment status at any time via online shipment tracking .
Contacting us: To begin the process, please contact us by email at support@menstruflow.de or fill out our contact form. Please include your order number and the number of products you wish to return.
Return shipping costs within the 60-day guarantee: Self-shipping (postage at your own expense): Please send the goods exclusively via insured shipping with tracking. The transport risk (e.g., loss/damage) remains with you as the sender until the package is received by us. No refund can be issued for uninsured shipments sent without tracking.
Conditions for a full refund: To receive a full refund, the ONEflow must be returned including all original accessories and packaging. If any parts of the ONEflow Starter Kit are missing upon return, the following amounts will be deducted from the refund:
ONEflow connection cable: €4.95
ONEflow original box including foam: €7.95 - sold separately for €4.95
Carrying case: €14.90
Instruction manual: €3.95
Charging cable: €4.95
Replacement Pads: Please note that for hygiene reasons, opened packages of replacement pads cannot be returned.
Special Offers: During special promotions such as Black Friday, Cyber Monday, Christmas, and others, we cannot cover return shipping costs. This policy applies regardless of our usual return policy or influencer code discounts. We appreciate your understanding that, during special offers, we cannot cover return shipping costs.
Please note that for hygiene reasons, we cannot accept returns of opened and used pads. If the following conditions are met, you can return the product within 14 days of the shipping date:
Unused
Original packaging
Sollte dein ONEflow aufgrund eines Material- oder Verarbeitungsfehlers innerhalb eines Zeitraums von einem Jahr, beginnend mit der Lieferung von ONEflow, nicht innerhalb normaler Toleranzen funktionieren, werden wir dir nach eigenem Ermessen:
(a) ONEflow reparieren oder ersetzen
(b) eine Gutschrift in Höhe des Kaufpreises gewähren
(c) kostenlosen Ersatz bereitstellen.
Im Falle eines Garantieanspruchs muss das Kaufdatum anhand des Verkaufsbelegs oder der Rechnung nachgewiesen werden. Reparaturen im Rahmen der Garantie sollten in der Garantiezeit entweder für das ONEflow oder für die Ersatzteile erfolgen.
Die folgenden Fälle sind von der Garantie ausgeschlossen:
(1) Schäden, die durch unsachgemäße Bedienung entstehen, z.B. Nichtbeachtung der Gebrauchsanweisung;
(2) Schäden aufgrund von Reparaturen oder Eingriffen durch den Kunden oder die Kundin oder unbefugte Dritte;
(3) Schäden, die beim Transport vom Verkäufer (menstruflow GmbH) zum Verbraucher oder zur Verbraucherin entstehen;
(4) Zubehör, das dem normalen Verschleiß unterliegt. Die Elektrodenpads, Anschlusskabel, Silikonhülle oder Gel-Pads sind nicht abgedeckt.
D. Die Haftung für direkte oder indirekte Folgeschäden, die durch ONEflow verursacht werden, ist ausgeschlossen, auch wenn der Schaden am ONEflow als Garantieanspruch anerkannt wird.
Rücksendekosten innerhalb der 60-Tage-Garantie: Selbstversand (eigene Frankierung): Bitte sende die Ware ausschließlich per versichertem Versand mit Sendungsverfolgung. Das Transportrisiko (z. B. Verlust/Beschädigung) liegt bis zum Eingang bei uns bei dir als Absender:in. Geht eine unversicherte/ohne Sendungsverfolgung aufgegebene Sendung verloren, kann keine Erstattung erfolgen.
Damit deine Rücksendung schnell und sicher bearbeitet werden kann, melde sie bitte immer vorab per E-Mail an support@menstruflow.de mit deiner Bestellnummer und der Anzahl der retournierten Produkte an.
___
Sonderaktionen
Während Sonderaktionen (z. B. Black Friday, Cyber Monday, Weihnachten oder andere Aktionszeiträume) können wir die Versandkosten für Rücksendungen leider nicht übernehmen – unabhängig davon, ob es sich um eine Rückgabe im Rahmen der Geld-zurück-Garantie oder eine Kulanzretoure handelt.
In diesen Fällen fällt immer eine pauschale Rücksendekostenbeteiligung von 3,95 € pro Rücksendung an.
The red indicator light illuminates during charging. When fully charged, the red light goes out and the blue light remains on. When ONEflow is switched on, the blue light flashes. The flashing speed increases with the intensity of the charge.
This has happened to all of us before – so don't worry! Alternatively, you can simply use a piece of cling film or, even better, a clear plastic sleeve/film. The sturdier the film itself, the better your pads will retain their shape.
Before applying your ONEflow, you should prepare your skin:
Trim excess hair in the treatment area instead of shaving it to avoid skin irritation.
Wash your skin and dry it completely.
The treatment area should be free of lotions/oils.
Ziehe die Schutzfolie auf den Pads ab (WICHTIG: Bewahre die Schutzfolie für die Wiederverwendung auf; am besten legst du sie wieder in dein GRATIS beigelegtes menstruflow Case)
Klebe ONEflow auf deinen unteren Bauchbereich (und / oder Unterrücken).
Wähle zwischen der Verwendung des großen Flow Pads plus den beiden kleinen Drop Pads, nur den kleinen Drop Pads oder nur dem Flow Pad.
Drücke kurz die EIN/AUS am ONEflow. Standardmäßig startet ONEflow im Modus 1 mit der niedrigsten Intensitätseinstellung. Das blaue Licht zeigt an, dass ONEflow eingeschaltet ist.
Drücke kurz die EIN/AUS, um die Modi zu wechseln. Die TENS-Modis kannst du unserer beigefügten Anleitung entnehmen.
Drücke die "+"- oder "-", um die Intensität anzupassen.
Um ONEflow auszuschalten, halte die EIN/AUS für 3 Sekunden gedrückt. Die LED erlischt.
Nach der Verwendung von ONEflow, sei vorsichtig, wenn du es von deinem unteren Bauchbereich entfernst. Befestige die Schutzfolien wieder an den Gel-Pads, um sie zu schützen und bewahre sie in deinem menstruflow Case auf.
To ensure you get the most out of your ONEflow, we recommend keeping it away from water during storage. For this, we recommend using the menstruflow case we've included, which can be sealed airtight.
After each use, you should reattach your pads to the provided adhesive strips. Please be careful not to lose them and protect the adhesive sides from dust. Again, it's best to store them in our FREE menstruflow case.
Before you continue, make sure ONEflow is switched off. The large Flow Pad has two snap fasteners in the middle for attaching the device. At the bottom of the device is the connection for the small Drop Pads' cable. You can connect this cable and then attach the two small Drop Pads to the existing snap fasteners at the end of the cable.
TIP: You can either attach the TENS unit directly to the Flow Pad in the center or connect it to the electrode cable for a portable option. This allows you to attach the unit to your trousers with the included clip, while the pad remains discreetly attached to your lower abdomen.
Once you have attached and switched on your ONEflow, it will begin therapy in mode 0. Briefly press the ON/OFF button on the ONEflow to switch modes, or use the app directly.
The best way to find out which mode suits you best is to try them out. Our co-founder Polina, for example, prefers modes 3 and 6.
Place the electrodes on the area where you feel pain. Perform treatments and adjustments based on your personal comfort. Our customers report that they usually wear it very low on their lower abdomen or lower back. You can use either just the large Flow Pad, just the Drop Pads (perfect for on the go), or all of them together.
Our pads last for approximately 30 uses. One use means: applying the pad once and then removing it.
If your cycle lasts about 28 days and you have pain on 2 days, you will only need an average of 2-4 pads per year*.
👉 Find your needs with our calculator: www.menstruflow.de/pages/pads-abo
*Care can affect durability.
When you subscribe to our service, you'll regularly receive replacement pads for your ONEflow TENS device to relieve period pain. You decide whether you want to receive both Flow Pads and Drop Pads, or just one of the two. With just a few questions, we can tailor the subscription specifically to you and your cycle. This way, you can be sure you're always well-equipped to relieve your period pain in time and manage everyday life despite your period. You can find out more about your right of withdrawal here.
We understand that every menstrual cycle is unique. That's why we offer flexible options for our subscription model. You can adjust the delivery frequency of your replacement pads for the ONEflow TENS unit for period pain relief at any time in your account . You can also choose whether you want only Flow Pads/Drop Pads or both. This ensures you always have the right remedy for menstrual discomfort available, especially when you need it most.
The frequency of replacement pads delivered through our subscription model depends on the regularity of your period. We adjust deliveries to your individual cycle to ensure you always have enough pads on hand to optimally use our ONEflow as a remedy for menstrual discomfort.
Of course! Education about pain and ONEflow as a remedy for period pain is very important to us. We have a portfolio of documents that we can always provide immediately. In addition, we are happy to discuss personalized and tailored information materials with you in individual cases. Just contact us directly.
PLEASE PLEASE! We are definitely open to more creative ideas and new ways of collaborating. Since we are still in the early stages ourselves, we are also very flexible and welcome any input 😊 Feel free to send us your idea(s) by email to hello@menstruflow.de or via contact form.
Since we are still very new to the market, we are currently exploring different ways of collaborating. We are happy to discuss test products on a case-by-case basis. Generally, we can only offer this as part of employee benefits for companies of a certain size.
We are open to any kind of collaboration – from content creators in the field, podcasts, and magazines to brands.
We've spent a lot of time thinking about how to realize our vision of a world where women and other menstruating people can continue their daily lives without restrictions, even during periods or with endometriosis. And what could be better than companies offering their employees the ONEflow option? We want to become the new "company bike" program, but with our ONEflow. It's a win-win-win situation for everyone involved! We'd be happy to discuss the specifics with you. We're open to companies of all sizes, because every menstruating person deserves to go through their day pain-free. For further details, please feel free to contact us by email at hello@menstruflow.de or via our contact form.
YES, YES, and YES! Currently, we are "only" an online shop. However, since we want to spread our message as quickly as possible, we are more than open to offline sales in pharmacies or retail stores. We are already in contact with the first pharmacies and look forward to onboarding more. We would be happy to discuss the exact details in person. Therefore, if you are interested, please send an email to hello@menstruflow.de.
When you start the app, simply click on "Continue as guest". We are currently experiencing a technical issue with the login process. You will have no restrictions as a guest. All functions are the same.
How to connect:
1️⃣ Attach ONEflow to your body and turn it on.
2️⃣ Start the app.
3️⃣ Tap "Continue as guest".
4️⃣ Select "Start pairing" and follow the instructions in the app.
5️⃣ Once your ONEflow appears in the search field, simply tap it.
✅ App and ONEflow are now connected.
✅ Connected and ready to go!
Hey! Es gibt ein paar mögliche Gründe, warum es nicht klappt:
Hast du deinen ONEflow nach dem 15.03.2025 gekauft?
Nur Geräte ab diesem Datum haben Bluetooth und sind app‑kompatibel.
👉 Für ältere Geräte haben wir ein Upgrade-Angebot für dich! Mit dem Code UpgradeONEflow bekommst du 20 € Rabatt auf ein neues ONEflow mit Bluetooth:
(Der Rabattcode funktioniert nur mit der gleichen E‑Mail‑Adresse, mit der du damals dein ONEflow gekauft hast.)
🔹Ist Bluetooth an deinem Handy aktiviert?
🔹Prüfe in deinen Handy-Einstellungen:
Einstellungen → Apps → menstruflow-App → Bluetooth aktivieren
Falls du noch Fragen hast, melde dich jederzeit bei uns – wir sind für dich da! 💜✨