ER0548B Features Designed to receive music from mobile phones or transmitters that supports Bluetooth Can be used with almost any audio receiver with an audio input jack including automobiles Allows you listen to music from your smartphone or MP3 player conveniently Sleep mode for power conservation Power Supply: Charges via mini-USB cable General Specs Brand EDUP   Model EP-B3502 Bluetooth Version V2.1 Transmit Power Class 2 Range 10 m Bluetooth Profile A2DP Frequency 2.4GHz Operation Time Up to 8hours Plug 3.5 mm stereo audio output Certificates CE， FCC Package Details Weight: 110.21 g Size: 17*11*2.5 cm Package Includes * Music Receiver * Data Cable * Audio Cable * 3.5mm Audio Adapter