Bengoo Stereo Wireless Radio 360 Degree Positioning FM Transmitter with Car Mount Phone Holder Support FM Transmitter Speaker Handsfree Hands Free Calling WIRELESS 3 IN 1 DEVICE:FM Transmitter/Built In Speaker/Clamp Holder.Built-in Battery,no need plug into the lighter socket.Plug the AUX Cable to connect this to your phone,it will work. Safe And Easily In Car To Play Music&Make Phone Call&Use GPS.Free your hands when you driving,you can Choose to make calls & play music through your car speakers OR built-in speaker! Specially Holder designed:The mounting bracket with strong suction cup that attaches the holder securely to your windshield/Dashboard,Moreover can 360 degrees rotate to offer you a comfortable viewing angle. Work 100% with any car radio,Even Old car radio:Stream music from any 3.5mm music player to your home or car stereos.Transmits on FM channels 88.1 MHz - 107.9 MHz, 0.1Mhz/step Compatible with: iphone 5S 5C 5 4S 4 6 6 plus/ipod ipad MP3/4 Music Player Samsung Galaxy S5 S4 S3 Note 3 2,HTC/Sony and so on.Note: The clamping range of the clip is 0-10cm. In other word, the width of your mobile device cannot exceed 10cm.