The SL130W is a Sound Level Alert with Alarm. Continuously monitor sound levels throughout the day using the Extech SL130W Sound Level Alert. Bright LEDs (red flashing or green) alert user when sound level is too high or too low - LEDs can be read from 30m (100ft). Wall, desk or tripod mount with optional 15ft (5m) microphone extension cable for remote monitoring. User programmable high or low limit (30 to 130dB) with output to drive external relay module. Ideal for industrial, hospital, auditoriums, schools and other areas where there is a need for being alerted when sound level reaches set points. Complete with 100-240V AC 50/60Hz adaptor, microphone windscreen, and built-in wall, desk and tripod mount (optional Tripod TR100). This product is NIST Certified.