Features:Delicately disc design， exquisite workmanship and mini size with lighter weight.Multi-function technique， one Bluetooth receiver can connect with two Bluetooth devices.High quality stereo transmission for a better music experience.Reverse control of the music play of connected Bluetooth devices.Safe driving design， it can be used as a Bluetooth carkit which with music play function.Specifications:Bluetooth version: Ver 4.0Transmission distance: ��10mContinuously working time: 5 hrsCharge time: 1.5 hrsUnit size��45mm*11mmPacking list:1 x Bluetooth music Transmitter1 x Mini USB Power Cable1 x 3.5mm Audio Cable