Product information :Material: AlloyBattery capacity: 280mahProduct weight: 180GBody memory: 64kbWearing method: wristbandOperation mode: touch + buttonInterface: USB 2.0Wireless distance: 5m (inclusive)-10m (inclusive)Function: heart rate monitoringColor: black steel, silver steel, gold and silver edge steel strip, gold steel, black leather, silver leather, gold shell black leather, brown leatherPacking list:Bare metal*1 Manual*1 Data cable*1 Packing box*1