Comfortable chest strap for heart rate monitoring, compatible with Polar products. Made of soft fabric and adaptive electrodes for enhanced sensitivity. An essential component of heart rate monitors, it accurately detects and transmits real-time heart rate data to smartphones. Popular worldwide for its ease of use and durability. Features a snap attachment design. Color: Black. This lightweight strap 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. Other items not included. Note: Lighting and display differences may cause slight color variations between image and actual product. Measurement tolerance: 13 cm.