Description:1. This product has a bluetooth hands-free phone.2. S7 is a special bluetooth fm transmitter, bluetooth handsfree, car mp3.3. Professional high-performance bluetooth module.4. Built-in MP3 / WMA decoder chip,U disk,or TF card music files wirelessly to the car stereo.5. As long as your phone is equipped with bluetooth,your phone will be able to send musichitting your car stereo,hands-free calls can be switched to the state,at the end of the call, it will automatically switch to the music player.Features:1 bluetooth FM transmitter: phone, U disk, TF card, MP3 music which is transmitted to the car stereo to play.2. Car Charging: via USB interface to the mobile phone / iPad smart charging.3. bluetooth hands-free: a mobile phone via bluetooth speakerphone key.4. Car USB: U disk can be read via the USB interface or read TF card slot.5. High-fidelity stereo, using DIGITAL, PLL PLL.6. LCD display frequency, choose a more convenient.7. Full-frequency transmitter (up to 200 frequencies can be selected).8. With power and memory, it can store the currently playing frequency.9. Direct buttons, play / pause, previous / next song.Specification:Operating voltage12-24VVoltage limit9-26Vbluetooth version2.1 + EDRbluetooth voice outA2DPbluetooth transmission distance10MFM Frequency87.5-108MhzPlayback FormatsMP3 / WAV / WMA / MP3 / FLAUSBOutput5V /2.5APackage Included:1 X bluetooth FM transmitter Car kit1 X User Manual