The user manual will guide you to use the FM modulator in detail.Rated Voltage: 12VLimit Voltage: 9V to 26VPower Consumption: 1WSNR: > 60dBFrequency Response: 20Hz - 15KhzBluetooth Version: v2.1 + EDRBluetooth audio process with A2DP functionBluetooth Transmission Distance: 10m - 15mFM Emission Frequency: 87.5 ~ 108MHzWorking Temperature: 0 ~ 50 Celsius degreesNote: This product can be compatible with most of the mobiles, however, some functions may be invalid due to difference of mobile. What"s In The Box: 1 x Bluetooth Car MP3 1 x FM Transmitter 1 x IR Remote Control 1 x Cable1 x User ManualePathDirect After Service: 30 Days Money Back Guarantee, 12 Months Warranty!