Operation range: Up to 10 meters Weight: about 12 grams Reversible hook for either ear with smooth material for long hold Capacity: Up to 3 hours talk time and 100 hours stand-by time. 9 hours in HV3/7.30 hours in HV2/6 hours in HV1(HV level set by mobile phone) Bluetooth specifications: compliant V1.1 Profiles: Headset profile, Handsfree Profile Activation of voice recognition on the mobile phone. Volume adjustment Specifications: 1) Frequency range: 2.4GHZ Spectrum 2) Dimensions: 68 x 24 x 12.5mm 3) Charging time: 3 hours 4) Talk time: up to 3 hours 5) Standby time: up to 100 hours