DC 9-24V Wide Voltage Power Supply with 9-channel one-on-one trigger interface. Supports low level trigger using GND as trigger signal. Supports MP3 and WAV decoding formats with audio file sampling rates up to 48KHz. Supports TF card storage up to 32G requiring FAT32 format. Includes Micro-USB Socket for connecting to PC to download music files. Equipped with a 30W Class D power amplifier capable of directly driving 4-8ohm, 10-30W speakers. External warning lights can be connected with voltage matching input voltage. DIP switch supports 8 trigger working modes. Volume adjusted via potentiometer and volume button. Module Size: 76x58mm. Includes 3-Bit Red Toggle Switch to set 8 different triggering modes; power restart required after changing modes. Light/Alarm Output provides voltage equal to input work voltage for connecting alarm or warning lights. Status Indicators: Green light for power ON, red light for playback. Colour: Black. Material: ABS. Model: A Low Level Trigger Bare Board L30T. Package Contents: 1 x Player Power Amplifier. Tolerance: +/- 1-3cm.