13 in 1 Design: This large screen decibel meter has an LED display screen, adjustable brightness, and is equipped with a decibel meter. This means you will have a noise meter, thermometer, and humidity meter, providing convenience for your work and life. 2High Accuracy: The sound level meter uses intelligent air semiconductor sensors to test the temperature and humidity values in decibels, it is more sensitive, accurate, and stable. 30130dB Measurement range with 1.5dB accuracy, 50Hz~8.5KHz frequency response range, 2085% humidity range with 5% accuracy, 10 ~50 temperature range with 5% accuracy. 3Wide Application: This noise monitor is an excellent tool for checking, monitoring, or controlling and testing any environmental sound level, and can be applied to noise engineering, product quality control, health prevention and treatment, and more. This large LED display can be hung on a wall or placed on a table, making it an ideal noise meter for testing sound levels in classrooms, studios, major transportation arteries, factories, construction sites, homes, offices, and more. 4Easy to Operate: This intelligent decibel meter widely applicable and the brightness is adjustable. You can also press the M button to adjust detection speed. There are three gears of fast, medium, and slow. 5Simple Charging: This decibel meter comes with a built in 2000mAh lithium battery power supply and a 10ft long USB charging cable. You can place it anywhere you want and charge it anytime, anywhere. 1 x Sound Level Meter 1 x User Manual 1 x USB Cable 1 x Installation Sticker 2 x Screw 2 x Wall Plug