DescriptionSmart vioce caller ID， power displayDSP noise isolation and echo cancellation technology for perfect sound qualityAdjustable ear-hook， comfortable to wearBluetooth hands free， enhance driving safetyOne-button control， easy to reach and hang up phone callsVolume control function for in-coming calls and music playVersion: V4.0Mode: Hands Free/HeadsetFrequency:2.4GHzTransmit Power: Class 2Range: 10MTalking Time: 3H aboutMusic Time: 3H aboutStandby Time: 90H aboutProduct Weight: 9.9g aboutsize:43.6 x 48.1 x 30.3mm