1. High-brightness 2.5D curved glass panel, 8 touch function icons. 2. Bluetooth function: support pairing with external Bluetooth devices such as mobile phones to achieve audio playback. Bluetooth name can be modified directly 3. AUX: support external audio input machine, amplification output. 4. Memory card function: external TF card, support USB flash drive. 5. Audio format: support MP3, WAV, WMA, FLAC, APE, DTS, AAC, AC3, OGG and other audio formats. Volume adjustment, previous song, next song. Support power-on playback: automatically play songs when powered on. Infrared remote control function: provide a variety of shortcut keys, humanized operation. Doorbell trigger: support external doorbell trigger function, GND is connected to the doorbell interface (doorbell interface). Trigger playback: GND is connected to the trigger playback interface to trigger, long the play/pause button to turn it off. Colour:Black Material:Metal+Plastic Package Contents: 1 * Embedded Host System Controller 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.