Functionality: Equipped with a large high-definition LCD screen, this decibel meter not only measures sound levels but also acts as a thermometer, hygrometer, clock, and timer. Its A-weighted SPL meter is specifically designed to mimic the human ear's sensitivity to low-intensity noises, making it compatible with ambient noise monitoring. Precision Measurement: With a sound level range of 30 - 130 dB and an accuracy of 1.5 dB, this meter covers frequencies from 35 to 8.5KHz. It also accurately measures humidity (20~85%) and temperature (-10C - 60C or 14-140F). Please note, due to varying environmental conditions, a deviation of 0~15% in readings is considered normal. Long-Lasting Battery Life: The desktop decibel meter is powered by a built-in 2000mAh lithium battery, offering 3 to 5 days of continuous use and up to a week on standby. It is compatible with prolonged monitoring in various settings such as studios, classrooms, and industrial environments. User-Friendly Interface: Adjusting settings is straightforward-enhance brightness with the 'left button', reduce it with the 'right button', and long press the 'M' button to set the time. Temperature readings can be switched between Celsius and Fahrenheit, making this device adaptable for use on any desktop. Important Usage Information: Each unit is calibrated and tested before shipment, which may result in the battery not being fully charged upon arrival. The battery indicator shows red during charging and turns green once fully charged, ensuring you are always aware of the power status. Color: White Material: Plastic Package Contents: 1 * Digital Decibel Meter