2-in-1 multi-functional design: car FM transmitter + car charger 1.44-inch LCD screen shows working status Adopt zinc alloy shell, compact and practical 3.1A maximum current output, charge your device very fast Built-in high-definition sensitive microphone with CVC intelligent noise reduction technology, support clear hands-free phone calls Support external TF card expansion, U disk,3.5MM AUX input/output With 90 degree rotations function Support voice prompts Support multi-function menu operation, EQ settings, language switching, etc. Support song fast forward, Bluetooth connection calls answer, hang up, reject, call back function Specification: Screen: 1.44-inch LCD lattice screen Bluetooth version: V4.1 Power supply: DC 12V-24V Working current: 50-100mA DC12V FM frequency: 87.5MHz-108.0MHz Support format: MP3/WMA/APE/FLAC/WAV Transmission distance: SNR: 85dB(FM: 65dB) Harmonic distortion: Working temperature: 0 to 60 Certification: CE, FCC Compatible with: iPhone iPad iPod Samsung Huawei Sony HTC etc. Bluetooth-enabled devices Package included: 1 x BT39 Bluetooth Car Hands-free FM Transmitter + USB Car Charger Accessories only, other things not included