Features7 sound level ranges: 50 to 126dB A and C weighting: for sound analyses fast/slow response: allows intermediate and high level measurements with battery level indication RCA output jack Specificationsrange: up to 126dB positions: 60, 70, 80, 90, 100, 110, 120dB load impedance : 1kohm min. distortion: < 2% at 1kHz, 0.5V microphone: electret condenser microphone, omnidirectional, directionality increases at higher frequencies precision: ± 2dB at 144dB weighting: A or C response: slow or fast output signal: max. 1V deviation at 1kHz for the entire range power supply: 1 x 9V battery (incl.) battery test: OK indication between 7 and 10.5V battery life: 110 operating hours (alkaline batteries) dimensions: 160 x 62 x 44mm weight: ± 185g