Functionality: Equipped with a large high-definition LCD screen, this decibel meter measures sound levels and functions as a thermometer, hygrometer, clock, and timer. The A-weighted SPL meter is designed to mimic the human ear's sensitivity to low-intensity noises, making it suitable for ambient noise monitoring. Precision Measurement: Measures sound levels from 30 to 130 dB with an accuracy of 1.5 dB, covering frequencies between 35 Hz and 8.5 kHz. It also measures humidity from 20% to 85% and temperature from -10°C to 60°C (-14°F to 140°F). Due to environmental variations, a deviation of 0–15% in readings may occur under certain conditions. Long-Lasting Battery Life: Powered by a built-in 2000mAh lithium battery, the device provides 3 to 5 days of continuous use and up to one week on standby, ideal for extended monitoring in studios, classrooms, and industrial environments. User-Friendly Interface: Adjust brightness using the left and right buttons; press and hold the M button to set the time. Temperature units can be switched between Celsius and Fahrenheit for added convenience. Important Usage Information: Each unit is calibrated and tested before shipment, which may result in a partially charged battery upon arrival. The battery indicator shows red during charging and turns green when fully charged, providing clear power status feedback. Color: White Material: Plastic Package Contents: 1 x Digital Decibel Meter Note: Light reflection and differences in display screens may cause slight variations in the color of the item shown in photos compared to the actual product. Measurement error allowance is +/- 1–3 cm.