Detail produk dari Bluetooth Hands-free Comprehensive Steering Wheel Remote Control Voice Prompts (Intl) How to use it: 1.Using FM transmitter function: 1)Plug the FM transmitter into your vehicle's cigarette or power port. 2)Turn your radio to an unused FM frequency, then match the same frequency of this unit. 3)Insert a USB flash drive or TF Card Reader which containing MP3 files into USB port or memory card slot of this unit accordingly, it will play and transmit the MP3 files automatically . 4)Line-in function for: Use the provided audio cable to connect an MP3/Mp4 players or another external device to the AUX input of this unit. 2.Using Bluetooth function: 1)Using Bluetooth for the first, you need to pair your mobile phone with this unit, Activate your phone's Bluetooth function, then search new device.When the mobile phone detects this unit(named as "BT Carkit"), Please pair and connect by using the original password "0000" (some mobile phone password is not required, automatically connect). Some mobile phone will be noted that whether authorized to connect automatically,just click "yes". 2)In the music playing mode, when there is an incoming call, this unit will automatically switch to telephone mode. Note:When you wanna to connect to another mobile phone, please disconnect the Bluetooth of your current mobile phone. 3.Bluetooth calling: 1)Please press the red "Answer/Hang off" button in the middle of the Bluetooth FM Transmitter keyboard to answer the incoming call, or directly press the green button in the remote controller. 2)Please press the "Answer/Hang off" button in the middle of the keyboard to hang off a call, or directly press the red button in the remote controller.