Decibel Data Logger: The digital decibel meter can record 32000 groups data; the data logging function is compatible with Windows 10; 8; 7; Vista and XP High Accuracy: Wide Measuring range 30~130dB; Accuracy 1.5dB; Frequency response 31.5~8.5KHz; Fast and Slow time weighting selection; display update time: 2 times/second (FAST); 1 time/second (SLOW) AC and DC Output: AC signal output 4Vrms/ full barograph; output impedance is approx; 600 ohm; DC signal output 33mV/dB Bar Graph Display: The LCD digital display can shows a 3 digit decibel level values; Auto Ranging Bar graph level; time and date Wide Applications: The decibel meter is handheld design and easy to carry; widely use for office; classroom; noisy neighbour; environmental measurement etc