Usage Tips:1. It is a multifunctional high-fidelity stereo sound audio decoder board which integrates Bt audio decoding, TF card, U disk music file decoding, computer USB sound card, LINE input. 2. 2.8-inch 320x240 pixels IPS color screen to do playback status and decoding related information display. Simultaneously support analog audio and digital audio (I2S) output function. 3. 3.5mm stereo line-in connector for inputting audio signals from cell phones, computers, MP3 players and other lines. 4. Support /AAC audio transmission protocol in Bt mode, support Bluetooth lyrics song title and other ID3 information display, and support spectrum display. 5. Built-in equalizer preset 7 EQ scenes + 1 custom EQ scenes, can be very good with the speakers and personal listening preferences to choose and adjust to their own sound. Support Simplified Chinese, Traditional Chinese and English display Operating voltage: 4.5-5.0V (need regulated power supply) Standby current: 20mA Operating current: 30-180mA Audio output signal power: ≤50mW Audio output signal-to-noise ratio: ≥104db Output audio signal level: ≤2.8Vp-p Number of audio output channels: 2 channels Audio hardware bit width: 24bit Bluetooth receiving distance: about 10 meters Bluetooth version: V5.3+BR+ Screen specification: 2.8 inch 320x240 pixels IPS screen Colour:Black Material:Plastic + Metal Package Contents: 1 x Decoder board module 1 x hexagonal wrench 4set x screws + nuts 1 x Remote control 4 x cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.