DC 9-24V wide voltage power supply 9-channel one-on-one trigger interface, capable of triggering up to 9 music files Low level trigger version, uses GND as trigger signal Supports MP3 and WAV audio decoding formats with sampling rates up to 48kHz Supports TF card storage (up to 32GB), must be formatted in FAT32 Micro-USB port for connecting to PC to download music files Equipped with a 30W Class D power amplifier, capable of directly driving 4-8 ohm, 10-30W speakers External warning lights can be connected; output voltage matches input voltage DIP switch provides 8 selectable trigger working modes Volume adjustment via potentiometer and volume button Module size: 76 x 58mm 3-bit red toggle switch to set 8 different triggering modes; requires reboot after mode change Light/Alarm output voltage equals input operating voltage; compatible with alarm or warning lights Dual LED indicators: green indicates power on, red indicates playback Color: Black Material: ABS Model: L30TK (low level trigger - finished product) Package Contents: 1 x Player power amplifier Note: Other items not included. Color may vary slightly due to lighting and display differences. Measurement error allowed within +/- 1-3 cm.