Comfortable and adjustable elastic strap Chest strap made from high-quality materials for close skin contact Soft fabrics and adaptive electrodes provide high sensitivity to heart electrical signals Compatible with various heart rate sensors supporting ANT+ and Bluetooth 4.0 Designed for heart rate monitoring, accurately detects and transmits real-time heart rate data to smartphones Works with compatible fitness devices from Polar, Wahoo, and Garmin Features a secure snap attachment system Model Number: Magene Heart Rate Chest Strap Snap distance: Approx. 45mm (verify compatibility with your device) Color: Black Material: Nylon/Polyurethane Size: Length approximately 98cm Package Contents: 2x Adjustable Elastic Strap Note: Light reflection and screen settings may cause slight color variation between image and actual item. Measurement tolerance is +/- 1-3cm.