Product Features Small appearance size, practical in most of the cars. Support Bluetooth 4.0/3.0/2.0, Support voice & calling prompt. Support charger for Android & Iphone or other device, max. Output 2.5A. Full frequency FM transmitter, total support 208 frequency. Digital Display. Support TF card/U disk MP3/SBC/WAV/WMA/FLAC/APE music play. Bluetooth answer, hang up, reject, redial calls and other functions. Echo cancellation and noise suppression (CVC) technology during a call. Automatic power-off memory function. Bluetooth stereo A2DP music play. Support to connect with two phones at the same time. Car Accumulator voltage detection. Note 1. USB port for this device only used for charging, it can provide maximum output to 5V/2.4A. Don’t use high-power electrical equipment or power inverter in order to avoid damage 2. When searching phone in Bluetooth mode, please make sure the phone within the normal range and Bluetooth in the matching state 3. In the status of inserting TF card/U disk, TF card/U disk will be in priority play status, if you want to connect Bluetooth, then you need to adjust the play mode, please see 5.1.1 or 5.2.1. 4. When the machine in FM transmitter, volume will not be too much (generally 25 or less position) in order to avoid sound distortion, adjust the volume using the car stereo adjustments. 5. The machine FM transmitter built-in antenna, while also should try to avoid using strong local radio frequency signals to get better sound quality. 6. Due to various differences in the phone itself, the method used in the Bluetooth may be different in practice. In the player again after power off, and some mobile phones may not automatically connect function, so need to use a manual connection again.