Large LCD Screen shows the incoming phone number, current song's name and the voltage of the storage battery clearly.Easy Installation,Plug and play, Easy to use. Fast Bluetooth pairing. Once paired, the FM transmitter will automatically connect with the last paired smart device when turned on next time. Adopted advanced interference and noise cancellation technology - CVC technology creates full duplex sound and suppresses noise and wind. Take hands-free calls for pleasurable driving experience! Compatible Phone Models: Most devices on the marke that Bluetooth enabled devices such as Samsung, HTC, Blackberry, Sony, Tablet etc. NOTE: 1.Please do not violently rotate the head part when using it (the rotation angle shall not exceed 90°). 2.Tune it to an unused station. 3.The max input & output current of the transmitter varies with charged devices, due to charged devices are able to limit output current automatically.