Specification: Specifications: Product Name: Colorful Car Bluetooth MP3 Bluetooth version: BT5.0 Support expansion: U disk / TF card A?L?64G (not included) Transmit frequency: 87.5MHZ~108.0MHZ Power supply: DC5V Output current: 3.1A Playback mode: FM FM playback Display: Frequency LED display Product material: ABS Effective distance: A?L?10m Use models: 12V ~ 24V size cars can be used Function: Support Bluetooth hands-free call, support MP3/WMA format music, hold USB/TF card / Bluetooth function Accessories list: Bluetooth car charger x1, manual x1 Fast charging 3.1:3.1A dual USB intelligent charging, a 3.1A, a 1A, efficient and fast charging, quickly charge compatible devices to 80%. U disk / TF Plug and Play: You can play music on the car stereo via Bluetooth / U disk / TF card, Bluetooth hands-free calling, one-touch operation, advanced noise reduction technology will ensure quality, no lag, so that the sound quality is more shocking. 7 Colors LED optional: support 7 colors LED backlight, including red / green / blue / yellow-green / purple / cyan / orange, with the interior ambient light, add mood for the night. Safety features: with voltage detection function, over power protection, over current protection, short circuit protection, overvoltage and other multiple protection, use more secure. Compatible with a wide range of 12V ~ 24V models, compatible with all kinds of cell phones, tablets, headphones, MP3 and other devices.