Comfortable chest strap for heart rate monitoring, compatible with Polar products. Made from soft fabrics and adaptive electrodes, it is highly sensitive and designed to work seamlessly with heart rate monitors by detecting and transmitting real-time heart rate data to smartphones accurately. This popular heart rate belt is user-friendly and durable, featuring a snap attachment design. Color: Black This lightweight garment 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, ensuring reliable detection of heart electrical signals for faster and more accurate heart rate readings. Material: Silica gel + fiber Belt length: 90–130 cm (35.4–51.2 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 tolerance is +/- 1–3 cm.