Comfortable and adjustable elastic strap Soft fabrics and adaptive electrodes extremely sensitive to your heart's electrical signals Compatible with different heart rate sensors (ANT+, Bluetooth 4.0, 5.3K) Comfortable chest strap for heart rate measurement compatible with , products. The smart fusion of soft fabrics and adaptive electrodes extremely sensitive to Being an indispensable part of heart rate monitor, it 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 . Utilizes the snap attachment method. With the chest strap based on high quality material, it can be attached to your skin closely.Utilizes the snap attachment method Model Number: Heart Rate Chest Strap Two snaps Distance: . 45mm (please check the distance of your transmitter and confirm the compatibility) Colour:black Material:Nylon/Polyurethane Size:Length about: 98cm Package Contents: 12x Adjustable Elastic Strap Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.