Product Description:This special car charger is with functions of Bluetooth music decoding and FM transmitter， with the special design of distinctive watch appearance， and takes the professional-grade high-performance Bluetooth and FM transmitter modules to transmit to the car stereo via wireless. After Bluetooth is turned on and connected， it will transmit to car audio to play the music in the device (the device with Bluetooth music function). When there are calls incoming， it will automatically pause on the music， and back to music player after calls end. No need making changes on settings， you can enjoy the music freely while driving.Product Features:1.USB: 5V/3.1A， charging smart phone， laptop and tablet ...etc.2.Two USB interfaces are able to intelligent distribute the currents.3.Input voltage: 9V-26V.4.Bluetooth version: V4.0， support A2DP function.5.Transmit the music from smart phone/ tablet/ laptop to the car stereo via Bluetooth.6.FM frequency points: 89.0 MHz， 94.5 MHz， 99.8 MHz and can be customized too.7.Echo cancellation and noise reduction.8.Convenient operation， without APP installation.9.Colors: black， white， etc...(optional).Product Parameters:Rated operating voltage 12V/24VWorking voltage limits 9V~26VUSB Output 5V/3.1AWorking Temp. -25 ~ 75 degreeSNR >63dBDistortion <0.05%Frequency Response 10Hz-18KhzFM transmission frequency 89.0 MHz， 94.5 MHz， 99.8 MHzBT Version Version 4.0Bluetooth sound processing A2DP(Advance Audio Distribution Profile)Bluetooth transmission distance 10 metersDimensions Height: 67.5mm， diameter: 32mmInstructions:1.Plug the Bluetooth car charger into the car cigarette lighter.2.Press on the Bluetooth function button more than 3 seconds， the light will be flashing， the Bluetooth is pairing successfully.3.Open the cell phone Bluetooth to search for the car charger Bluetooth named "FM music"， the light will stop flashing and the Bluetooth is connected.4.Open the car FM radio and adjust to one of the frequency points showing on the surface of car charger (89.0-94.5-99.8) (in order to ensure music sound effects， please try to select a channel which is not occupied by Radio).5.After setting the car radio， press the FM button on the side of Bluetooth car charger for selecting the same frequency point as car FM radio(when the Bluetooth is connected， the light indicates the current FM transmission frequency， it proves FM frequency is matched).6.USB port: power supply output port (5V/3.1A default)， can charge for mobile phones or tablet etc. Intelligent current distribution of two USB interfaces.NOTE: No need to match again next time， as long as the Bluetooth car charger and cell phone are matched before， automatic available connecting distance is 10M.