Features: Feature: Wide measurement ranges: 30~130dBA, 35~130dBC. High Accuracy. With modern, easy to carry design. Easy to use. Time weighted characteristic: Fast & Slow output. Bar graphs indication. Equipped with sponge ball to filter out unwanted signals. Reading hold, USB interfaces. Analyse software. Auto power off. Auto backlit display. Low battery indication. Power by 4x1.5V batteries (not included). Specifications: Material: ABS Measuring ranges: 30dBA~130dBA, 35~130dBC Frequency ranges: 31.5Hz~8.5KHz Digital Display: 4digits Resolution: 0.1dB Measuring level: 30~130, 40~90, 50~100, 60~110, 80~130 Sample rate: 2 times/second Microphones: 1/2inch electret condenser microphones Power supply: 4xAA 1.5V Battery(not included) Operating condition: 0~40℃, 10~80% Storage condition: -10~60℃, 10~70% Package Includes: 1pc Sound Level Meter 1pc Operation Manual 1pc Sponge Ball 1pc USB Cable note: Please allow 1-2cm errors due to manual measurement. Due to difference between different monitors, the picture may not reflect the item actual color.