Features: 1) Uses Bluetooth technology 2) Designed to be used with different Bluetooth mobile phones 3) Users can talk on the mobile phone hands-free Parameters: 1) Bluetooth Version: Version 1.1 2) Operating distance: 10m 3) Weight: 9g 4) Range of frequency: 2.4GHz spectrum 5) Dimensions (L x W x H): 60 x 25 x 10mm 6) Talking time: up to 4.5 hours 7) Standby time: up to 100 hours 8) Nominal charging time: within 3 hours 9) Ear compatibility: adjustable for both left and right ears 10) Battery: rechargeable Li-ion battery, low battery indicator Packing: Gift box