Decibel Meter Wall Hanging Sound Level Meter 11 inch Large LED Display Noise Temperature Humidity Meter with Alarm Icons Indicator Wide Applications for Classroom, Studio, Home, Factory 11 inch LED 3-IN-1 Decibel Meter is multi-functional, it's a accurate noise temperature humidity meter, equipped with 4-color alarm icons, which is more convenient to monitor the decibel level, an ideal sound level meter to test the sound level for Classroom, traffic routes, factories, construction site, home, offices, etc. Dual-Usage Decibel Meter: Can be mounted on the wall or place on the table 4 Colored Icons Indicator: Noise Alarm Icons will automatically switch when the decibel at different level Adjustable Brightness: Press [UP] and [DOWN] buttons to adjust brightness Fast/Slow Button: Press [M] button to choice of 3 sampling speeds: Fast, Medium, Slow Large Capacity Lithium battery: this decibel meter powered with 2000mAh Lithium battery 11'' Large LED Display: could see the real-time level of Decibel, Temperature and Humidity Clearly 10 FEET(300CM) Charging Cable: Can mount the sound meter in anywhere you want, no worry the charging cable is not length enough Specifications: Measurement range:30~130dB Accuracy: 1.5dB Frequency response range: 50Hz~8.5KHz Humidity range: 20~85% accuracy: 5% Temperature range: 14~122? 3-IN-1 FUNCTION:This wall mounted decibel meter combines a sound level meter, humidity meter, temperature meter, and noise level indicator into one,the brightness and the sampling speed can be adjusted LARGE LED DISPLAY:Our decibel meter is equipped with 11'' LED display,the brightness can be adjusted,you can see the real-time decibel level ,temperature and humidity clearly HIGH ACCURACY:The measurement range is 30~130dB, accuracy: 1.5dB, frequency response range: 50Hz~8.5KHz; Humidity range: 20~85%, accuracy: 5%; Temperature range: 14~122?.Compared to ordinary decibel meters,it is more sensitive,accurate,and stable LONG-LASTING USAGE:The sound level reader with built-in 2000mAh lithium battery power supply and a 10 ft long USB cable for charging anywhere,anytime.The battery can lasts 3~5 day after fully charged,equiring charging only once a week WIDE APPLICATION:The decibel meter can be placed flat on a desktop or used as a wall-mounted device,suitable for testing the sound level in Classroom, Studio room, traffic routes, factories, construction site, home, offices, etc