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The most popular heart rate strap in easy to use is still durable. Uses the method of pressure attachment. With the chest strap based on high-quality materials, it can be attached tightly to the skin. Comfortable chest strap to measure heart rate, compatible with: Lightweight clothing is compatible with ANT heart rate sensors (from + Bluetooth 4.0, 5.3K).; Product description Product description LAXED Color: Black Material: silicon dioxide + fiber Belt length: 90-130 cm. Package includes: 10 x Adjustable Elastic Strap Only the above package, the products are not included. Note:Light shooting 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. Ingredients Silica gel + fibre; Product description Product description LAXED Color: Black Material: silicon dioxide + fiber Belt length: 90-130 cm. Package includes: 10 x Adjustable Elastic Strap Only the above package, the products are not included. Note:Light shooting 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. Ingredients Silica gel + fibre; Product description LAXED Color: Black Material: silicon dioxide + fiber Belt length: 90-130 cm. Package includes: 10 x Adjustable Elastic Strap Only the above package, the products are not included. Note:Light shooting 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. Ingredients Silica gel + fibre