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 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 of soft fabrics and adaptive electrodes 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 . With the chest strap based on high quality material, it can be attached to your skin closely.Utilizes the snap attachment 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: 2x Adjustable Elastic Strap Only the above package content, other products are not included. Note: Light 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.