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 heart's electrical signals with different heart rate sensors (ANT+, Bluetooth 4.0, 5.3K) Comfortable chest strap for heart rate measurement with , , products. The smart 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 popular heart rate belt in the world easy to 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 Number: Heart Rate Chest Strap Two snaps Distance: Approx. 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 the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.