DC 9-24V wide voltage power supply 9-channel one-on-one trigger interface, capable of triggering up to 9 music channels Low level trigger version, uses GND as trigger signal Supports MP3 and WAV o decoding formats, with sampling rates up to 48kHz Supports TF card storage up to 32GB, formatted in FAT32 (not NTFS) 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 adjustable via potentiometer and volume button Module size: 76 x 58mm 3-bit red toggle switch to set 8 different triggering modes; requires power cycle after mode change Light/Alarm output: output voltage same as 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. Slight color variations may occur due to lighting and display differences. Measurement error allowed within +/- 1-3 cm.