This is a brand new, unopened item. It is a COOSPO HW706 optical arm band heart rate sensor. ◼︎[Support for Multiple Apps] Supports connection to Wahoo, Runkeeper, Zwift, Sports Tracker, and many other apps. ◼︎[Bluetooth and ANT+] Compatible with Bluetooth 4.0 and ANT+, smartphones, tablets, GPS watches, fitness equipment, etc. ◼︎[Convenient and Fast] Charges with a dedicated USB cable. No need to replace the battery. 20 hours of operation. Waterproof IP67.