Fangrui Product Details Description: This Product Is An Environmental Quality Monitor That Detects Noise, Temperature And Humidity. Information Technology Combines Sensors With Real-time Monitoring Of Noise, Temperature And Humidity On Monitors. Specification: Material:plastic Product Size:270 X 118 X 35mm Led Screen Display Detection Method For Noise : Electret Condenser Microphone Concentration Unit For Noise : Db Measuring Range: 1-95dba Temperature Unit : Celciu Power Supply:rechargeable Li-battery 2000mah,includding Usb Chargeing Cable 3m Exceeding Alarming With Auto Detection And Auto Measuring Screen Brightness Can Be Adjusted By Hand Large Screen ,wall Mount Design Colour: Black Package Contents: 1 X Noise Tester 1 X Usb Cable Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Error Is +/- 1-3cm.