Comfortable chest strap for heart rate monitoring, compatible with Polar products. Made from soft fabrics and adaptive electrodes for high sensitivity. An essential component of heart rate monitors, it accurately detects and transmits real-time heart rate data to smartphones. Popular, durable, and easy to use. Features a snap attachment design. Color: Black. Lightweight and compatible with all heart rate sensors supporting ANT+ and Bluetooth 4.0. Constructed with high-quality materials for close skin contact, ensuring efficient detection of heart electrical signals for faster and more accurate readings. Material: Silica gel + fiber. Belt length: 90–130 cm / 35.4–51.2 in. Package includes: 10 x Adjustable elastic strap. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1–3 cm.