1. 9-24V wide voltage power supply 2. 9 one-to-one triggering interfaces, triggering up to 9 tracks 3. Supports MP3 and WAV decoding formats, and supports audio file sampling rates up to 48KHz 4. Support TF card (up to 32G) and USB flash drive (up to 32G) storage; TF card and USB flash drive must be in FAT32 format 5. Audio files can be replaced by connecting the computer with a USB data cable Equipped with a 60W Class D power amplifier, it can directly drive 4-8 , 20-60W speakers Warning lights can be connected externally, and the voltage of the warning lights needs to be consistent with the power supply voltage Set 8 triggering working modes for the dial switch Volume potentiometer to adjust volume Color: Black Material: ABS Package Contents: 1 * Voice Broadcast Device Sound Board 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.