Bluetooth V2.1 technology.Need not setup any software and easy to use.Support : A2DP & ARVCP.Support paired Bluetooth stereo headsets/earphones to control play/pause,forward/backward.Support automatism paired (no button).Support paired pin code: 1234, 0000, 8888.Range of frequency: 2.42 to 2.480 GHz(SIM) spectrum.Support automatism standby mode: standby mode is started to save power when the stereo Bluetooth headsets/earphones is not found time.Support for , for mini, for nano, for video, etc.Compatible with 30-pin dock.Type: Bluetooth TransmitterRange of Frequency: 2.42 to 2.480GHz( SIM) SpectrumWorking Current: 40mA(Max)Distance: 10 Colour:blackMaterial:Plastic + MetalPackage Contents:1 x 30 Pin Bluetooth Audio TransmitterOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.