This Decibel Meter with PC Interface is compact and easy to use while providing you an accurate readings in a greater range than similar inexpensive sound meters on the market. This sound meter can read between 30dB-130dB , and capture data to a PC using the compatible software (included in the set). Applications includes : Environmental measurement, law enforcement, work place design, sound level analysis of machinery and engines. Auto Ranging Fast or Slow time weighting selection 32000 Reading Internal Memory (Data record function) Data Logging function Max Hold function Frequency weighting: A or C High Accuracy Bar graph display AC or DC function PC Interface (Compatible with Windows 10, 8, 7, Vista and XP) When connected to computer, the measurement are live on computer screen too White Backlight Adjustable Over or Under alert threshold via computer interface Maximum data recording limit can be adjusted via the PC interface Time display Auto-off function setup Low Battery Alert Tripod Mount (Tripod not included) Includes CD Software (language: English), AC or DC wire and batteries) CE Certified and RoHS Compliant Standard Applied: IEC651 type 2, ANSI SI .4 type 2 Calibration sound source: 94dB 1kHz Measurement range: 30-130dBA Accuracy: and1.5dB(reference sound pressure standard,94dB 1KHz) Record Interval: 1-60 sec or 1-60 min or 1-24 hrs Frequency response: 31.5-8.5KHz Resolution: 0.1dB Frequency weighting: A or C Analogy bar graph: 2dB or 1 Bar graph Measurement Unit: dBA or dBC Sampling rate: 2 times or second (FAST), 1 time or second (SLOW) AC signal output: 4Vrms or full barograph, output impedance is approx 600 ohm DC signal output: 33mV or dB Dynamic characteristic: FAST (high speed) or SLOW (low speed) Data storage quantity: 32000 readings Windows Compatibilty: Windows 10, 8, 7, Vista and XP (Do not run in Mac OS) Power supply: 4pcs x AA Size 1.5V battery or USB power cable Item Weight: 7.4 ounces Product Dimension: 9 x 2.5 x 1.5 inches Shipping Weight: 14.6 ounces Shipping Dimension: 9.