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: Offers a sound level range of 30 - 130 dB with an accuracy of ±1.5 dB, covering frequencies from 35 Hz to 8.5 kHz. It also measures humidity (20–85% RH) and temperature (-10°C to 60°C or 14°F to 140°F). Note that 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, providing 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 the battery not being fully charged upon arrival. The battery indicator shows red during charging and turns green when fully charged, allowing clear power status monitoring. Color: White Material: Plastic Package Contents: 1 × Digital Decibel Meter Note: Light reflection and differences in display screens may cause slight color variations between the product image and the actual item. Measurement error allowance is ±1–3 cm.