Colorful ambient light: Lights in seven colors with automatic adjustment satisfy various needs and create a pleasant atmosphere. Support for fast charging 5V 3.1A: With two USB charging ports, enables fast charging at 5V 3.1A without affecting charging speed. Compatible with various mobile phone sound apps: Can be used with various sound apps on mobile phones, transmitting sound through the car audio system, without restrictions on mobile phone models. MCU+DSP dual-core processor: Compatible with Android and iOS systems, the background noise reduction processor makes music playback and mobile phone conversations clearer. Compatible with various brands of music USB drives: Up to 32GB expansion, with free switching of playback modes. Playback function with power-off memory: Automatic connection upon restart. High resolution, high-performance stereo sound: No lag, support for MP3/FLAC/APE and other lossless formats, enabling playback of various audio formats. Parameters: - Frequency response: 20Hz~15kHz - FM transmission frequency: 87.5-108.0MHz - Bluetooth version: 5.0 - Transmission range: 10-15m - Operating voltage: 10-24V - USB output: 5V 3.1A / 5V 1A