4. Battery Powered: This decibel meter has a built in 2000mAh rechargeable li battery, charging 2 hours to continuous use for 24 hours 1. Decibel Meter: Using acoustic chip and accurate measurement technology, it displays noise, temperature, and humidity in real time on an LCD screen, allowing you to clearly know the noise level and take effective noise reduction measures 2. Accurate Measurement: The noise measurement range is 30dB to 130dB, with a measurement accuracy of ± 1.5dBA and a display accuracy of 0.1dBA. Real time monitoring and providing you with accurate data on sound levels in the environment 3. LCD Display: This sound level meter adopts a large size digital LCD screen with backlight, which provides clearer reading effect in dark places; Supports desktop placement, takes up less space, and does not require handheld work, more convenient to use 5. Temperature and Humidity Detection: The temperature measurement range is 14-140 ℉ (-10-60 ℃), and the humidity measurement range is 20%-85%. Press the left and right keys to adjust the screen brightness to the desired setting, convenient and practical, Weight: 0.92153225516 pounds, Manufacturer: Tuidzljd