DS18S BT-318 Bluetooth Wireless In-Car Bluetooth FM Transmitter with Charging, Music Control and Hands-Free Calling Hands free talking, LED display, Bluetooth Blue Core 3 Technology, Excellent sound quality with DSP solution for echo cancellation, CVC Noise Suppression, Supports USB Disc, TF Card and SD Cards. Broadcast Music stored up by your car stereo system, Full Duplex DSP Technology, 21 Keys Remote Controller and Steering Remote Controller. Chargers for Iphones/Samsung/HTC/Blackberry/Nokia/MOT, and many more Includes a 3.5 mm Aux cable for other Compatible Music Devices or any MP3/MP4 Players 12-24V Rated Voltage, 90mA Rated Current, 1W Power Consumption, 32-122 Degrees Fahrenheit Working Temperature, Supports MP3/WMA File Formats, SNR &gt; 60dB, 0.1% Degree of Distortion Left and Right Channel &gt; 60dB, 30 Feet of Transmitting Distance, Bluetooth Microphone Effective, 1.5-6 feet Range, 87.5-108MHz Transmitting Frequency, 20Hz-15KHz Frequency Response