Comfortable chest strap for heart rate monitoring, compatible with Polar products. Made of soft fabric and adaptive electrodes for enhanced sensitivity. Acts 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. Features a snap attachment design. Color: Black. This lightweight garment is compatible with all heart rate sensors supporting ANT+ and Bluetooth 4.0. Constructed from high-quality materials for close skin contact, ensuring efficient detection of heart electrical signals for faster and more accurate readings. Material: Silicone gel + fiber. Belt length: 90130 cm / 35.451.2 in. Package includes: 5 x Adjustable elastic straps. Note: Other items not included. Lighting and display differences may cause slight color variations between image and actual product. Measurement error allowance: 13 cm.