About this itemSmart QC 3.0 Fast ChargingZeaLife Bluetooth FM Transmitter has two USB ports to charge two devices at the same time. One of them is a USB QC 3.0 port for fast charging, 4 times faster than a standard charger. (Compatible with: QC 2.0, FCP Huawei, Samsung and HTC.) At maximum power, charging efficiency is over 80%, so your device can be fully charged in no time.[Passive Bluetooth] Advanced Bluetooth 4.2 technology provides more stable connection and faster transmission. When connected to Bluetooth, the built-in microphone with CVC noise reduction technology lets you speak clearly. Accept/end/reject call/restore last call by pressing a button. Careful driving.Multiple music playback methods Enjoy lossless stereo music transfer. Allowing you to play music via Bluetooth / USB flash drive ( 64G) / TF card ( 64G) connection, this Bluetooth FM transmitter will offer you more stereo and dual channels with its high fidelity system. MP3/WMA/WAV/FLAC/APE format files are supported. It provides you with quality car music to make your trip more interesting.Easy to use- Plug it into the cigarette lighter socket. Turn on your car's FM radio and select the empty frequency. - Set the same frequency as the transmitter (87.5-108.0MHz). 4 - Connect your mobile phone to the transmitter (called C57) via Bluetooth. Then you can listen to music without interference.Multiple Protection] The ZeaLife Bluetooth FM Transmitter is equipped with overcurrent, overvoltage, short circuit protection and intelligent power control. temperature.