Delivering clean and clear sound quality wirelessly! High performance noise and echo cancelling bluetooth-enabled headphones for mobile phones, Iphone 3g, 3gs, laptops etc (currently not compatible with iPhone 2G for use when playing back music). Will work with 3G and 2GS ! Can also be used as a handsfree Kit and for other applications such as msn, skype, yahoo etc. Has a folding headband for easy storage, answer Button switches automatically between music and incoming calls. Features: Bluetooth v2.1 + EDR Class 2 Supports latest version of A2DP 1.2 and AVRCP 1.0 Profiles Supports Bluetooth Headset and hands free profile (HFP 1.5) 5 Button design :MFB, VOL +VOL-,FWD,REV. LED Indicator Status : Blue, Red Microphone for hands free function Skip track function Volume control Rechargeable 400mAh Li-Polymer Battery Charge Adapter Output: DC 5V&200 mA 5-10 meter working distance Working time : UP to 20 hours Standby time : UP to 400 hours Dimensions (Main Body) : 54 X 23mm Weight : 71.2g 20 hours music playback time, hi-fi sound activity, folding headband design and attractive price. Changing Track function does not work on iPhone (all models) all other functions will work.