Bluetooth Wireless FM Transmitter Hands-free MP3 Player USB Charger Modulator Feature: 1.Adjustable to any angles, and fit to all types of vehicles 2.Supports bluetooth 4.0\/3.0\/2.0, support voice & calling prompt 3.Support charger for Android & iPhone or other device, max. Output 2.5A 4.Full frequency FM transmitter, total support 208 frequency 5.Digital Display 6.Support MP3, WMA music play 7.Bluetooth answer, hang up, reject, redial calls and other functions 8.Echo cancellation and noise suppression (CVC) technology during a call 9.Automatic power-off memory function 10.Bluetooth stereo music play Specification: Rated operating voltage: 12V-24V Working voltage limits: 9V-28V USB output: 5V\/2.5A Memory card format: MP3\/WMA\/WAV\/FLA Bluetooth version: Bluetooth V2.1+EDR baseband and modem Bluetooth transmission distance: 10M FM transmission frequency: class2 and class3 Bluetooth receiver sensitivity: -85dBm sensitivity SNR: SNR>93dB The microphone valid distance: 0.5-2m Working temperature: 0-50 degree Distortion: <0.1% Frequency response: 20Hz-15Khz FM transmission frequency: 87.5-108Mhz FM transmitter: stereo digital PLL locking Package included: 1 X Bluetooth Car FM Transmitter 1 X User Guide Usage: Enter the body's cigarette butts into the base point, after power supply, product turned on automatically. Power on the device and enter into bluetooth mode, LED will display real frequency. For the first connect with bluetooth handsfree needs the code to connect. In the Bluetooth hands-free state, the phone's Bluetooth feature is set to open, and search to “FM01” devices and will display on the phone. Select “FM01” devices and automatic pairing (the voice prompt “pairing successfully”) Note: 1.Don't use high-power electrical equipment or power inverter in order to avoid damage 2.Don't use the product in a particularly high or low temperatures and dusty, humid environment 3.If long time no use the device, please take out from the cigarette hole. For normal use, please insert into after auto ignition, it can avoid damage by too high gnition voltage 4.When the machine in FM transmitter, volume will not be too much.