... Lmax,SD,Ld,Ln,Ldn,1/1 frequency spectrumFilter characteristics1/1 frequency intervalcentre frequency: 31.5Hz,63Hz,125Hz,500Hz,1kHz, ... display functionPower 5 pieces of alkaline batteries, DC 7.5v, with input hole for external powerDimensions Main machine: 240mm× ... 81mm×31mm Printer: 178mm×81mm×31mmWeight 0.4kg , printer: 0.41kg digital sound frequency analysis meter