Is there a subscription?
No. The S1 costs €99, one-time payment. The F24H app requires no subscription.
Is delivery free?
Yes, delivery is free with no minimum order. See the Shipping page.
Is after-sales service in French?
Yes, our after-sales service is 100% French. Use the contact form.
Which colors are available?
Black and gray. Orange, khaki green and midnight blue are temporarily out of stock: leave your e-mail on the product page to be notified.
What is the S1 battery life?
10 days, with magnetic charging: up to 80% in 60 minutes.
Is the S1 waterproof?
Yes, 3 ATM. It withstands splashes and showers. It is not a diving product.
What does the S1 measure?
Heart rate, HRV, SpO2, respiratory rate, sleep, steps, calories, VO2 max and heart-rate zones. See Accuracy and methodology.
Does the S1 work with Apple Health and Google Fit?
Yes, through the F24H app.
Can I return my product?
Yes, for 14 days after receipt. See Returns and refunds.
Is it a medical device?
No. The S1 is a wellness and training tracking tool.