Feature: 1. Wide Application:Decibel meter can be used to measure noise, such as engineering, schools, hospitals, shopping malls, theaters, offices, road traffic, homes, stereos, etc. 2. High Accuracy: Sound level meter can accurately detect noise, with a measuring range from 30 to 130dBA and a shift function, so it is practical. 3. LCD Screen: Noise level meter adopts LCD screen, which can clearly display the numerical value and has good anti interference. 4. Backlight Function: Sound monitor has backlight function, saves electricity, and is suitable for collecting sound data at night. 5. Data Transmission: Noise detector can perform data transmission function through USB data cable, and upload it to the computer for analysis. Specification: Item Type: Decibel Meter Material: ABS Product Size:Approx. 7 x 3.5 x 24.5cm / 2.8 x 1.4 x 9.6in Power Supply: 5V USB Power Cord Battery Model: 4 x 1.5V AA Battery (Shipped Without Battery) Measuring Range: 30-130dBa or 35-130dBc (suitable for Noise Detection in Any Aspect) Measurement Accuracy: 1.5dB The Frequency: 31.5HZ-8.5HZ Shift Switches: 30-80dB,40-90dB,50-100dB,60-110dB,70-120dB,80-130dB,30-130dB Digital Display: 4 Digits Resolution: 0.1dB Display: LCD Display Uses:For Engineering, Schools, Hospitals, Shopping Malls, Theaters, Offices, Road Traffic, Homes, Acoustics, Etc. Weight: Approx. 360g / 12.7oz. Package List: 1 x Decibel Meter1 x USB Power Cord1 x CD1 x User Manual Note: Shipping without batteries