Dare to challenge your fitness with the Axis HR fitness tracker. All day long, and even during your most energetic workouts, ActivePulse™ ensures that you get accurate heart rate tracking with three optical sensors. Curved, OLED touchscreen display ActivePulse™ heart rate tracking MoveReady™ auto-activity detection Net calorie real-time tracking # of Settings: 1 Number of Batteries: 1 Number of Settings: 1 Features: Battery Operated, Bluetooth Compatible Battery Type: Lithium Ion Base Material: Silicon Country of Origin: Imported