About this item Smart QC 3.0 Fast Charging: ZeaLife Bluetooth FM Transmitter features two USB ports to charge two devices simultaneously. One port supports QC 3.0 for fast charging, up to 4 times faster than a standard charger. Compatible with QC 2.0, FCP, Huawei, Samsung, and HTC devices. Charging efficiency exceeds 80% at maximum power, enabling quick device charging. Passive Bluetooth: Advanced Bluetooth 4.2 technology ensures a stable connection and faster data transmission. Built-in microphone with CVC noise reduction technology enables clear voice communication. Easily accept, end, reject, or redial calls with one button. Promotes safe and convenient hands-free calling while driving. Multiple Music Playback Options: Supports lossless stereo audio transmission. Play music via Bluetooth, USB flash drive (up to 64GB), or TF card (up to 64GB). High-fidelity audio system delivers rich stereo sound with dual channels. Supports MP3, WMA, WAV, FLAC, and APE audio formats for high-quality in-car entertainment. Easy Setup: Plug into the vehicle’s cigarette lighter socket. Turn on the car radio and select an unused FM frequency. Set the transmitter to the same frequency (87.5–108.0 MHz). Pair your mobile phone with the device via Bluetooth (device name: C57) to enjoy seamless, interference-free music playback. Multiple Protection Features: Equipped with overcurrent, overvoltage, and short circuit protection. Includes intelligent power management and temperature control for safe and reliable operation.