Comfortable and adjustable elastic strapWith the chest strap based on high quality material, it can be attached to your skin closelySoft fabrics and adaptive electrodes extremely sensitive to your heart's electrical signalsCompatible 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 toBeing 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 attachmentModel Number: Heart Rate Chest StrapTwo snaps Distance: . 45mm (please check the distance of your transmitter and confirm the compatibility)Colour:blackMaterial:Nylon/PolyurethaneSize:Length about: 98cmPackage Contents:2x Adjustable Elastic StrapOnly 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.