Description : Powerful IC , More stronger compatibility , support A2DP V1 . 2 stereo profile . Clip Design : Mini size with clip design the feature of portable can let you carry them to anywhere you want . 3 . 5mm Standard Plug : Metal material , detachable two - way 3 . 5mm male to male audio connector , compact and easy to carry . Built - in Microphone : Support hands - free calling Widely Use : Suitable for mobile TV , , MP3 , MP4 , speaker , headset , laptop , car speaker , and other devices with 3 . 5mm audio jacks . How to Use : System status : Power on / off : MFB long press for 3 seconds Volume plus : short press VOL + Volume minus : short press VOL - Switch language : Double click MFB in pairing state Music control : : Short press MFB Previous song : VOL - long press for 2 seconds Next song : VOL + long press for 2 seconds Telephone control : Answer the call : Short press MFB when calling Refuse to answer the phone : press MFB when calling Redial : Double - click the MFB button , then short press MFB to cancel dialing Led light shows : Boot pairing : red and blue lights alternately flash Connection status : blue light flashes slowly ( 5 seconds 1 time ) Low voltage : red light flashes ( 0 . 5 seconds 1 time ) Specification : Type : Audio Receiver Material : Plastic Quantity : 1 pc Version : 5 . 0 Frequency Range : 2 . 4GHz Profile : A2DP Transmission Range : Up to 10m / 33ft I / O : 3 . 5mm female plug , Mini USB female port Power Supply : DC 5V Charge Time : About 30 min Working Time : About 4h Size : 1 . 4 * 1 . 5 * 5 . 8cm / 0 . 5 * 0 . 6 * 2 . 3 & quot ; ( L * W * H ) Package Includes : 1 Piece Clip receiver 1 Piece USB power cable 1 Piece 3 . 5mm input 1 Piece Instruction Manual