Max Hold Function - Frequency Weighting: A - Weight: 3.77 oz..Small Shape for Easy Portability - Operation Temperature: 0 to 40ºC (32 to 104º F).Level Range: 35-100dB - Storage Temperature: -10 to 60º C (14 to 140º F).Accuracy: /- 3dB (ref. 94dB @ 1kHz) - Battery Type: 9V (Included).Frequency Range: 31.5 Hz to 8 kHz - Dimensions: 6.69'' H x 2.28'' W x 1.38'' D Check out this convenient mini sound level meter from Pyle. It uses A-level weighting for environmental noise measuring and other tasks. Max hold function keeps the top level held in memory. Works from 35 to 100 dB, at 31.5 Hz to 8 kHz with an accuracy of /- 3 dB. The small shape is easily portable. 9V battery included.