NIUNIU describe: Designed with Bluetooth compatible hands-free calling, it can bring you convenient and safe calls. It has a memory function to play the song that was played before the power outage. It is made of high-quality materials for durable use. After adjusting the frequency of the car to the same frequency as MP3, you can insert the U disk and play music immediately. Say goodbye to FM radio ads and listen to the sounds you want with thousandsof music apps on one phone. Supports mainstream MP3, WMA, APE, FLAC, WAV and other lossless audio formats, providing lossless sound quality for your driving experience. This product is 8cm long, 5cm wide and 4.5cm high. After the wireless Bluetooth compatible connection is successful, the car audio will play the real-time voice of the mobile APP map navigation, instantly becoming your personal car navigation assistant. Plug the player into the car cigarette lighter, the player screen will light up and show the startup status. The battery voltage is displayed for three seconds and prompts whether the voltage is normal. Enter autoplay at the same time. With over-power protection, over-temperature protection and anti-leakage protection. It works on most cars. Compatible with various electronic products such as mobile phones, tablets, Bluetooth headsets, MP3 players, etc. Single or double charge at the same time. Project Name: FM Transmitter Material: ABS, Metal Compatible Models: Universal, Applicable mobile phone: for Apple/Android Output current: 3.4A (MAX) Bluetooth version: 4.0 Music format: MP3, WMA, APE, FLAC, WAV