Car Bluetooth FM Transmitter Dual USB Charger Socket Aux Adapter Hands-free Fast ChargingFeatures:Characteristic:The transmitter is powered by 12 ~ 24 V automobile cigarette lighter hole,Support u disk and memory card playNoise suppression (CVC)Rotary shaft design, easy to useCharging all kinds of smart phonesSupport mp3 / wma music formatWireless transmission of audio to radioExcellent sound quality and d.s.p. echo cancellation solutionsSpecifications:Microphone range: 0-2mAudio distortion: 0.1%Left and right channel spacing > 60dBSNR > 60dBRated working voltage: 12VPower consumption: 1WBluetooth version: 5.0Material: plasticSupported formats: MP3, wmaFrequency response: 20hz-15khzTransmission frequency: 87.5-108mhzWorking temperature: - 20-50 Limit working voltage: 9-26 VBluetooth transmission distance: 10-15mPacking list:1 x FM transmitter for hands free car kit