3 color LED indicator: red, yellow, and green for clear visual status signals. Three flash modes: quick flash, slow flash, and always on to convey different levels of urgency. Customizable signaling with audio: set the signal light to any color and any flash mode, and enable the built in sound alarm. Built in memory and MP3 playback: 4 MB flash memory supports MP3 files up to 4 minutes in length at 128 Kbps. USB audio file management: replace audio files by connecting to a computer via USB; the device appears as a USB flash drive with no auxiliary software required. Flexible serial communication: supports baud rates of 4800, 9600, 19200, 38400, 57600, 115200, 256000, and 35250. Volume control via serial: adjust the sound volume by sending the appropriate serial commands. Two to three practical use scenarios - Factory or machine room status indicator: use a green steady light for normal operation, yellow slow flash for warning, or red quick flash for fault conditions, all synchronized with the audible alert to grab attention. - Control panel alert system: configure color and flash mode to match specific processes or safety protocols, with an audible cue to ensure immediate recognition by staff. - Training, classroom, or lab signaling: play back instructional audio files while using color and flash cues to guide students through procedures or demonstrations. Key benefits - Immediate, multi channel signaling combining visual color coding and audible alerts. - Flexible and easily configurable without software installation. - Easy content management through simple USB drive replacement. - Broad compatibility with multiple serial baud rates and on device volume control. - Compact memory capable of handling short MP3 audio for clear briefing and warnings.