55mm LCD display with function indicators, bargraph and backlight.Standard 4mm camera bush for tripod mounting.Designed to meet IEC 61672-1 class 2 with accuracy of ±1.4dB.1/2" electret condenser microphone ensures accurate and repeatable readings. Auto ranging 30 to 130dB, manual ranges 30 to 80dB, 50 to 100dB, 80 to 130dB.Selectable ‘A’ or ‘C’ frequency weightings.Fast or slow response filters.Min/max, data hold with peak max and peak min.Auto power-off after 15 minutes of no activity.Wind muffler, USB cable (1m) , software, AC/DC mains power adapator, 3.5mm earphone plug, hard carry case and battery all included.