SOUND LEVEL METER The Extech SL130W Continuous Sound Level Alert Meter continuously monitors sound level from 30 to 80dB, 60 to 110dB and 80 to 130dB. When noise is too high or too low, an LED alert flashes to warn the user. This is particularly useful in hospitals where it is important to maintain a quiet, calm environment. The user can set the alarm limits to his/her preference in order to suit the environment. A practical design allows the Extech SL130W to be mounted on a wall, on a tripod or on a desk so it is easily visible. A green LED will indicate that sound levels are acceptable whilst a red LED will signal a problem. The Extech SL130W conforms to IEC Type 2 Sound Level Meter standards and has a number of advanced features including programmable A/C weighting, adjustable response time, and recording of maximum value with a time stamp. Sound Level Alert with Alarm Features Wall, desk or tripod mount with optional 15ft (5m) microphone extension cable for remote monitoring Bright LEDs (red flashing or green) can be read from 100ft (30m) Continuous monitoring of sound level in 3 ranges: 30 to 80dB, 60 to 110dB, 80 to 130dB User adjustable high or low limit (30 to 130dB) with output to drive external relay module Built-in desk, wall and tripod mounts Meets ANSI Type 2 and EN 60651 accuracy specs - compliant to OSHA Complete with 100-240V AC 50/60Hz adaptor and microphone wind cover Specifications:  Display: 4.6"x3.125" multi-function LCD Frequency bandwidth: 31.5Hz to 8kHz Microphone: 0.5" electret condenser microphone (remoteable) Measurement ranges: 30 to 80dB, 60 to 110dB, 80 to 130dB Frequency weighting: A & C (programmable) Response time: Fast (125ms), Slow (1s) (programmable) Resolution: 0.1dB Alarm output: 3.5mm mono phone plug, maximum: 3.4mA @ 5 VDC Minimum output Voltage: 2.5 VDC Power: AC/DC adapter for full functions; 8xAA batteries for monitoring function only without LED alert Dimensions: 8.75"x7.1"x1.25" (22x18x3.2mm) Weight: 0.63 lbs. (285g) CE: Yes Warranty: 1 year Included Accessories 1 - Microphone Wind Cover 1 - AC Adaptor 1 - Built in Wall, desk and Tripod mount (TR100 Not Included)