Calibration sound source: 94dB @ 1kHz Measurement range: 30~130dBA Accuracy: +1.5dB(reference sound pressure standard,94dB@1KHz) Frequency response: 31.5~8.5KHz Resolution: 0.1dB Frequency weighting: A/C Analogy bar graph: 2dB/1 Bar graph Sampling rate: 2 times/second (FAST), 1 time/second (SLOW) AC signal output: 4Vrms/ full barograph, output impedance is approx 600 ohm DC signal output: 33mV/dB Dynamic characteristic: FAST (high speed) / SLOW (low speed) Data storage quantity: 32000 readings Power supply: 6V (4pcs AA Size 1.5V battery) (NOT INCLUDED) Dimension: 245 x 70 x 25m Features: DECIBLE DATA LOGGER TO PC The digital sound decibel meter can record 32000 groups data, the data logging function is compatible with Windows 10, 8, 7, Vista and XP. Bar Graph DisplayThe LCD digital display can shows a 3-digit decibel level values, Auto Ranging Bar graph level, time and date. Well Build and High AccuracyWide Measuring range of 30~130dB decibels at an accuracy of +/-1.5dB with 0.1dBA resolution. AC/DC OutputAC signal output: 4Vrms/ full barograph, output impedance is approx. 600 ohm. DC signal output: 33mV/dB. CE Certified & RoHS Compliant Wide ApplicationsThe noise pressure decibel meter is compact and easy to carry, widely use for office, classroom, noisy neighbour ,environmental measurement,etc. Wide Application: This sound level decibel meter is ideal for measuring noise levels in fenvironmental measurements, law enforcement, workplace design, machinery and engine sound level analysis. Package includes: 1 x Sound Level Meter 1 x English User Manual 1 x CD Software (English) 1 x USB Cable 1 x AC/DC line 1 x Carrying Pouch