Bluetooth V2.1 technology.Need not setup any software and very easy to use.Support profile: A2DP & ARVCP.Support paired bluetooth-compatible 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-compatible headsets/earphones is not found in due time.Support for iPhone, for iPod mini, for iPod nano, for iPod video, etc.Compatible with 30-pin dock.Type: bluetooth-compatible TransmitterMaterial: ABSRange of Frequency: 2.42 to 2.480GHz( SIM) SpectrumWorking Current: 40mA(Max)Distance: 10 MetersSize: 9cm x 6cm x 1cm/3.54" x 2.36" x 0.39" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x bluetooth-compatible Transmitter