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 reading deviation of 0–15% is normal. Long-Lasting Battery Life: Powered by a built-in 2000mAh lithium battery, the device supports 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, ensuring ease of use in various settings. Important Usage Information: Each unit is calibrated and tested before shipping. The battery may not be fully charged upon arrival. The battery indicator turns red during charging and green when fully charged, providing clear power status. Color: White Material: Plastic Package Contents: 1 x Digital Decibel Meter Note: Light reflection and display differences may cause slight color variation between the product image and actual item. Measurement error allowance is +/- 1–3 cm.