Comfortable chest strap for heart rate monitoring, compatible with Polar products. Made from soft fabrics and adaptive electrodes, it ensures high sensitivity and accurate real-time heart rate transmission to smartphones. A popular and durable heart rate belt designed for ease of use. Features a snap attachment method. Color: Black This lightweight strap is compatible with all heart rate sensors supporting ANT+ and Bluetooth 4.0. Constructed with high-quality materials, the strap fits closely to the skin, effectively capturing heart electrical signals for faster and more accurate heart rate detection. Material: Silica gel + fiber Belt length: 90130 cm / 35.451.2 in Package Included: 2 x Adjustable Elastic Strap Note: The package includes only the items listed. Other products are not included. Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowance: 13 cm.