Features: Auto Ranging Fast/Slow time weighting selection 32000 Reading Internal Memory (Data record function) Data Logging function Max Hold function Frequency weighting: A/C High Accuracy Bar graph display AC/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 / 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/DC wire & batteries CE Certified & RoHS Compliant Specifications: Standard Applied: IEC651 type 2, ANSI SI .4 type 2 Calibration sound source: 94dB @ 1kHz Measurement range:30~130dBA Accuracy:+1.5dB(reference sound pressure standard,94dB@1KHz) Record Interval: 1~60 sec / 1~60 min / 1~24 hrs Frequency response: 31.5~8.5KHz Resolution:0.1dB Frequency weighting: A/C Analogy bar graph: 2dB/1 Bar graph Measurement Unit: dBA / dBC 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 Windows Compatibility: 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 Weight: 14.6 ounces Dimension: 9.6 x 4 x 2 inches Set Includes 1 x Sound Level Meter 1 x English User Manual 1 x CD Software (English & Chinese) 1 x USB Cable 1 x AC/DC line 4 x AA Battery 1 x Carrying Pouch