Polar H10 Chest Strap Heart Rate Monitor ANT + Bluetooth, Waterproof Hr Sensor

Black polyester strap with small silicone dots to help keep in place when wearing. Used a max of 15 times total. Has over 350 hours of battery life left (started with a total of 400 hours as brand new) Still has plastic wrap on the screen. Weighs 0.12 kg or 0.26 lb. Feels barely noticeable when running, swimming, cycling, etc. compatible with iPhone 5 and later with iOS 11 or later, and Android devices with Bluetooth 4.0 capbility and Android 5.0 or later.