Fangrui Product Details Comfortable And Adjustable Elastic Strap With The Chest Strap Based On High Quality Material, It Can Be Attached To Your Skin Closely Soft Fabrics And Adaptive Electrodes Make It Extremely Sensitive To Your Hearts Electrical Signals Compatible With Different Heart Rate Sensors (ant+, Bluetooth 4.0, 5.3k) Comfortable Chest Strap For Heart Rate Measurement Compatible With Polar, Wahoo, Garmin Products. The Smart Fusion Of Soft Fabrics And Adaptive Electrodes Make It Extremely Sensitive To Being An Indispensable Part Of Heart Rate Monitor, It Will Detect And Send Your Real-time Heart Rate To The Smart Phone Accurately. The Most Popular Heart Rate Belt In The World Easy To Use Yet Is Very Durable. Utilizes The Snap Attachment Method. With The Chest Strap Based On High Quality Material, It Can Be Attached To Your Skin Closely. Model Number: For Magene Heart Rate Chest Strap Total Length: Approx. 98cm Before Elastic (elastic And Adjustable To Fit Different Body Size) Two Snaps Distance: Approx. 45mm (please C