Comfortable chest strap for heart rate measurement compatible with Polar, Wahoo, Garmin products. The intelligent fusion of flexible tissue and adaptive electrodes make it extremely sensitive to Being an indispensable part of the heart rate monitor, it will accurately detect and send your heart rate in real time to the smartphone. The most popular heart rate belt in the world, easy to use, is very durable. Use the instant fixing method. Black color This light garment is compatible with all heart rate sensors (ANT +, Bluetooth 4.0, 5.3 K). With the chest strap made from high quality material, it can be attached to your skin closely. Your hearts electrical signals, so the heart rate sensor can pick up your heart rate faster and more accurately. Material: silica gel + fibers Belt length: 90-130cm / 35.4-51.2in Package included: 1 x adjustable elastic strap Note: Light shooting and different displays may cause the color of the item in the image to be slightly different from reality. The allowed measurement error is +/- 1-3 cm.