Features: 7 sound level ranges: 50~126dB A and C weighting for sound analyses Fast/slow response allows intermediate and high level measurements RCA output jack. Specifications: Positions: 60, 70, 80, 90, 100, 110, 120dB b Load impedance: 1Kohm min Distortion: < 2% at 1KHz, 0.5V Microphone: Electret condenser microphone, omnidirectional, directionality increases at higher frequencies Precision: ± 2dB at 144dB Output signal: Max 1V deviation at 1KHz for the entire range Power supply: One 9V battery, included Battery test: OK indication between 7 and 10.5V Battery life: 110 operating hours (alkaline batteries) Dmensions: 6.3" x 2.4" x 1.7" Weight: 185g