DC 9-24V wide voltage power supply 9-Channel one-on-one trigger interface, triggering up to 9 music Low level trigger version and directly using GND as a trigger signal Supports MP3 and WAV decoding formats, and audio file sampling rates up to 48KHz Supports TF card (up to 32G) storage and must be in FAT32 format(not NTFS)<br><br>Micro-USB Socket: Connect to PC and download music files. Equipped with a 30W Class D power amplifier, it can directly drive 4-8ohm, 10-30W speakers External warning lights can be connected and voltage is same to input voltage DIP switch is set with 8 trigger working modes Potentiometer and volume button adjusts volume Module Size:76X58mm 3Bit Red Toggle Switch:Set 8 different triggering modes, which must be powered on again after changing the mode. Light/Alarm Output: Output voltage is the same to input work voltage. It can connect alarm/warning lights. Two Indicator: Green after power ON and red when playing. (For Power supply and Playback) Colour:Black Material:abs type: A:low level trigger-bare board L30T<br><br>Package Contents: 1 x Player power amplifier<br><br>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.