DC 9-24V wide voltage power supply 9-Channel one-on-one trigger interface, triggering up to 9 music channels Low level trigger version, directly using GND as a trigger signal Supports MP3 and WAV decoding formats, audio file sampling rates up to 48KHz Supports TF card (up to 32GB) storage, must be in FAT32 format (not NTFS) Micro-USB socket: Connect to PC to download music files Equipped with a 30W Class D power amplifier, can directly drive 4-8ohm, 10-30W speakers External warning lights can be connected; output voltage is same as input voltage DIP switch with 8 trigger working modes Potentiometer and volume button for volume adjustment 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 matches input working voltage; compatible with alarm or warning lights Two indicators: Green when powered on, red during playback (for power and playback status) Color: Black Material: ABS Model: B (low level trigger - finished product L30TK) Package Contents: 1 x Player power amplifier Note: Light reflection and display differences may cause slight color variation between image and actual item. Measurement error allowance is +/- 1-3cm.