Item type: Car Bluetooth FM Transmitter + USB Car Charger with Voltage Display Frequency range: 87.5-108.0Mhz Output Frequency: 20Hz-15KHz Power voltage: 12-24V Work temperature: 0-50 Degrees Support file format: MP3/WMA USB Charge output: 5V/2.5A (Max.) USB disk Maximum support: 32G Micro SD Maximum support: 32G Bluetooth version 2.1 + EDR Bluetooth sound processing: A2DP (Advance Audio Distribution Profile)function support Transmit distance: Up to 10m Effective distance of Bluetooth microphone: 0-2M SNR:>60dB FM mode: Stereo digital PLL frequency locking Size: approx. 100*80*25mm Audio cable length: approx. 31cm