Product Specifcations Display method: LED Screen Atmospheric pressure: 86kpa-106kpa Sampling time: 1.5 seconds Concentration unit for Decibel:dBA Product Size:270*90*35mm Detection temperature: 14-122? Relative humidity:20%-85% Storage temperature: 14? to 140?; Power source: Lithium battery with 2000 mAh capacity Product weight 350g Decibelindicator Less than 40dB ?Green 40dB~60dB ?Yellow 60dB~70dB ?Orange More than70dB ?Red Product List Decibel Meter*1 Manual *1 Positioning sticker *1 USB cable *1 Screw *2 Rubber stopper *2 Large screen LED display Decibel Meter: This decibel meter adopts LED display with adjustable brightness.3 in 1 function can meet your different needs, real-time display sound decibel, temperature, humidity Face Indicating Decibel Meter: The decibel meter sound level reader can automatically switch the face icon according to different levels of noise, [green face] less than 40dB; [yellow face] 40~60dB; [Orange face] 60~70dB;[red face] more than 70dB High Accuracy: Measurement range is 30~130dB, accuracy: +/-1.5dB, frequency response range. 50Hz-8.5KHz; Humidity range: 20-85%, accuracy: +/-5%; Temperature range. 14-122?, accuracy: +/-5%. It is more sensitive, accurate and stable Easy To Use: This decibel meter is powered by a built-in 2000mAh lithium battery and comes with a 10-foot USB flash drive. This smart decibel meter can be used directly. Click ? to enhance the brightness, click ? to reduce the brightness, click M to adjust the detection speed: fast or slow Wide Application: This decibel meter can be used in noise engineering, product quality control, health prevention and so on. This large LED display decibel meter can be hung on the wall or placed on the table, it is an ideal noise meter for testing the sound level in classrooms, studios, traffic avenues, factories, construction sites, homes, offices, etc.