Compact 4trigger MP3 player module with builtin 30W class D amplifier. Designed for flexible, reliable audio playback in equipment that uses lowlevel or ground trigger signals. Industrial grade design with strong antijamming capability and wide 12 to 24V DC power input for stable performance. Key benefits Four independently configurable trigger inputs let you connect buttons, switches, relays, sensors, or alarm outputs and control playback directly with lowlevel signals. Builtin MP3 playback and 30W class D amplifier reduce system complexity and eliminate the need for a separate amplifier. Simple file management via USB or micro SD card no extra software needed makes sound updates fast and easy. Configurable trigger modes and adjustable volume provide flexible behavior for different installations and use cases. Main features Four trigger inputs, triggered by negative pulse lowlevel signal or ground. Trigger wire colors: yellow K1, green K2, blue K3, white K4. Trigger wire length about 50 cm. Builtin MP3 player module with 30 Watts class D amplifier. Audio format MP3. Builtin 4 MByte flash memory, stores up to about 4 minutes of MP3 at 128 kbps. Supports micro SD card for extended memory. USB data cable included, length about 74 cm. When connected to a computer the module appears as a USB flash drive so you can copy sound files without special software. Each trigger input can be set independently through a configuration file to one of multiple trigger functions or to act as volume up or volume down. Volume adjusted by small potentiometer on the internal circuit board. Any two trigger inputs can be set as Vol plus and Vol minus via the configuration file. Wide power input 12 to 24V DC and strong antijamming capability for stable operation in industrial or field installations. Technical specifications Working voltage: 12 to 24 V DC Working current: greater than or equal to 2000 mA at DC 12 V Standby current: less than or equal to 10 mA Power consumption: less than or equal to 30 W Flash memory size: 4 MBytes Audio format: MP3 Trigger wire length: about 50 cm USB cable length: about 74 cm Trigger modes Each trigger input can be assigned a parameter value in the configuration file. Parameters 0 through A map to these modes: 0 Pulse interruptible 1 Hold for playback in a loop 2 Pulse noninterruptible 3 Pulse noninterruptible and hold for playback in a loop 4 Hold for playback once 5 Single in a loop 6 All in a loop 7 Previous track 8 Next track 9 Volume plus A Volume minus Control and compatibility Controlled by lowlevel trigger signals from buttons, switches, relays, sensors, or equipment alarm outputs. File upload via USB appears as a standard USB flash drive. No special drivers or programs required. Micro SD supported for more storage. Typical applications Interactive displays and kiosks where visitor actions must trigger audio prompts or narration. Security and alarm systems that need voice alerts activated by lowlevel alarm outputs. Small PA or paging setups in retail, industrial, or public spaces where compact, integrated audio control is required. What you get MP3 player module with four trigger inputs and builtin 30 W class D amplifier USB data cable for uploading audio files This module provides a compact, configurable audio playback solution for equipment that requires triggered audio output, simple file management, and reliable operation under varied power conditions.