This product is a car wireless adapter, which is made of ABS material, with good texture, safe and practical. Easy to install and use, it can be easily applied to your car. It is a very practical accessory that will meet your needs well. Features -Color:Multi -Material:ABS, components -Size:6.80X6.70X3.30cm/2.67X2.63X1.30in Support storage: up to 64GB card/USB drive (not included) Frequency: 87.5MHz-108.0MHz Output current: 3.1A Transmitting range: within 10m Input: 12-24V Version: 5.0 - No fear of bumps, uninterrupted power supply, firmly lock into lighter, and accompany you on your journey. - Compatible with various brands of U disk / card, adjust the frequency of the car audio machine to match with the wireless MP3 frequency to play songs from U disk. - Insert the wireless car adapter into the lighter, and the screen will turn on the mobile phone wireless to search and click to connect when the screen is flashing. - Comes with over-current, overheat, overload, short circuit, , static current and magnetic field protection, safe to use. - Outstanding workmanship, reasonable design, stable and practical, will bring you a . Package list: 4 wireless adapter