Frequency : 2.402GHz-2.480GHz, Range : 20-30 Meters (Depending on device), Li-ion battery : 3.7V/180mA, Playback Time : /< 5Hrs . Please make sure the charging time is about 2 hours at the first time. Package : Wireless Earphone, Micro-USB to USB charging Cable, User manual. Wireless listen to music integrated with Bluetooth technology. Bluetooth 4.1+EDR technology is compatible with almost all Bluetooth-enabled mobile device. Helmet Bluetooth headset allows you to pick up hands-free call safely. Truly free your hands. Never worry about missing any call when riding a motorcycle.