Comfortable chest strap for heart rate monitoring, compatible with Polar products. Made of soft fabric and adaptive electrodes for enhanced sensitivity. Serves as an essential component of a heart rate monitor by accurately detecting and transmitting real-time heart rate data to smartphones. Popular, durable, and easy-to-use heart rate belt featuring a snap attachment method. Color: Black. Lightweight design compatible with all heart rate sensors supporting ANT+ and Bluetooth 4.0. Constructed from high-quality materials to ensure close skin contact for improved signal detection. Material: Silicone gel + fiber. Belt length: 90130 cm (35.451.2 in). Package includes: 2 x Adjustable elastic straps. Note: Other items not included. Due to lighting and display differences, actual product color may vary slightly from images. Measurement tolerance: 13 cm.