Feature:1. High Accuracy And Sensitivity: Our wall hanging sound level meter offers high accuracy in measuring noise and CO2 levels, displaying noise levels from 30-130dBA and CO2 levels from 400-5000 ppm with clarity and sensitivity.2. Smart Application Control: With the for TuyaSmart mobile app, you can easily control our sound level meter and CO2 detector by connecting to WiFi, allowing you to monitor and access historical data conveniently.3. Rechargeable Battery And Adjustable Brightness: Featuring a micro USB charging port and a 2000mAh large capacity battery, our wall sound decibel meter can be used for extended periods without the need for frequent battery changes. Just 2 hours of charging ensures a 24 hours usage. Additionally, you can adjust the display's brightness to guard your eyes under different lighting conditions.4. Convenient Installation: Designed with wall mount holes and accompanying adhesive wall stickers for easy installation, our wall hanging type decibel meter comes with a 10ft long USB charging cable, allowing you to place it wherever needed and charge it anytime, anywhere.5. Double Function: The wall mount sound level meter not only accurately measures noise levels but also detects CO2 levels, providing you with comprehensive environmental monitoring in one convenient device. Its high accuracy, smart controls, rechargeable battery, and user friendly design make it an ideal choice for home, office, or industrial use.Specification:Item Type: Wall Decibel MeterMaterial: ABSScreen Display: HD LCD ScreenAPP: for TuyaSmart APPCO2 Detection Range: 400-5000ppmNoise Detection Range: 30-130dBASampling Time: 1.5 SecondsBattery: 1 x 2000mAh Rechargeable Li Ion Battery (Included).Package List:1 x Sound Level Meter1 x Manual2 x Screws2 x Expansion Screws1 x Auxiliary Installation Sticker1 x USB Cable