Designed for driving use, with this small device you can stream music and calls directly from your device, like smart phone, to your car FM stereo system. Make your driving more safe and enjoyable. Multi-function, such as , hands-free calling, music playing, let you use it more conviently. Two extra USB ports let the users can charge their personal digital device and play USB Drive music on the same time. Feature - Fit with most kind of 12-24V vehicle, universal and easy to use, just need to plug it in. - This product has the integrated functions of , car mount MP3,USB charger and audio output,etc. - Moreover, as long as your mobile phone is equipped with , you can transfer the music from your mobile phone to your car stereo. - Large screen display show you more useful information of your car. Let you know your car and smart device more well. - Calls can be switched to the hands- . At the end of the call, the music will be automatically switched to play. - USB output voltage, which can charge 2 devices at the same time. - T-flash and U-disk supported, let you use it more freely and easily. Support max 32GB storage or U disk, large storage capacity means it can storage more. - Warm Tip: Dear buyer, Due to lighting effect, monitor’s brightness, manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you! Specification - Color: Black. - Material: ABS - Size: 8 x 4 x 7cm. - Rated working voltage: 12V-24V - working voltage: 9-32V - USB1 output: 5V/2.4A - Support music format: MP3/WAV - Support U disk capacity: 1G-32G - Support capacity: 1G-32G - version: Version4.2+EDR - transmission distance: less than 10M - microphone effective distance: 0.5-2M - FM transmission frequency: 87.5-108.0MHZ Package list: 1 x Audio Signal Transmitter