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's perfect for 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 'M' to set the time. Temperature readings can be switched between Celsius and Fahrenheit, making this device adaptable and easy to use on any desktop. 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 (-10°C - 60°C or 14℉-140℉). Please note, due to varying environmental conditions, a deviation of 0~15% in readings is considered normal. 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 ideal for ambient noise monitoring. Important Usage Information: Each unit is calibrated and tested before shipment, which may result in the battery not being fully upon arrival. The battery indicator show red during charging and turn green once fully , ensuring you are always aware of the power status., Weight: 0.91932763254 pounds, Manufacturer: ximie