4in1 Design: The 4-in-1 function is designed to combine a sound meter, thermometer, humidity meter and clock in one. It is a useful tool for testing, monitoring or controlling and testing the ambient environment and sound level. Semiconductor Sensor: Adopts semiconductor air sensor, it tests temperature, humidity, and decibel values with high accuracy and sensitivity. Digital Color Display: 11inch large LED display with time, temperature, humidity, and decibels display function, all the data can be seen at a glance. And the brightness is adjustable. 6 Gears of Decibels Design: 6 gears of decibel level indicator design with three different colors of green, yellow and red to indicate different decibel levels, also with three indicator symbols. USB Charging Design: Built-in 2000 mAh lithium battery, USB cable charging, with long endurance. Wide Applications: Simplicity and dewign, can perfectly fit in any modern designed home or office furniture, widely used in homes, schools, offices, hotels, etc.