Microphone: 112 inch etectret condenser microphone Display: LCD, 4 digits, 0.1dB resolution, 0.5 sec display update; (125mS) fast response time; 13.5dB at 1kHz, 94dB reference accuracy; OVER displayed when input is greater than 130db; meter automatically shuts down after approximate 15 minutes of inactivity; One 9V, 006P or IEC 6F22 or NEDA 1604 battery; 32 to 104 degree F operation temperature; 0 to 90 percent RH operation humidity; 14 to 140 degree F storage temperature; 0 to 75 percent RH storage humidity; 5-3/4" x 2 x 1-1/4" Dimensions (including wind screen). Measure sound level of: home theater systems, home stereo systems, pa systems, alarm systems, musical performances, car audio, industrial sounds, environmental sounds.