Ideal for quick and easy environmental sound level checks measuring range 30 to 130db x 01db a frequency weighting fast time response weighting precision inch electret condenser microphone 30mm lcd display with function indicators display updates every 05 seconds backlight in dark environments data hold minmax of measured values auto power off after 15 minutes of no activity low battery indicator can be tripod mounted 2 year warranty supplied with wind muffler and battery