Advanced beat-to-beat measurement heart rate monitor is ten times more sensitive. Features an ANT+ bridge that collects data from other ANT+ sensors. Transfers via Bluetooth to most any iOS or Android device. Comfortable, easy to wear, featuring a soft, flexible adjustable strap for a perfect fit. Functions as an activity logger, can store up to 65 hours worth of data and then transfer it to another device or application. Tap-to-pair connection technology allows user to tap your iOS or Android device to the Viiiiva pod to immediately connect. Display compatibility offers freedom to use any ANT+ and Bluetooth compatible displays. Easily pairs with fitness equipment for real-time gym data. Fully integrates with all other 4iiii and Sportiiii coaching tools. Battery: 200+ riding hours on a replaceable 2032 coin cell battery.