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 from 35 Hz to 8.5 kHz. Accurately measures humidity (20%–85%) and temperature (-10°C to 60°C or 14°F to 140°F). Due to varying environmental conditions, a deviation of 0–15% in readings may occur. 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 settings easily—increase brightness with the left button, decrease with the right button, and press and hold 'M' 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; battery may not be fully charged upon arrival. Battery indicator shows red during charging and turns green when fully charged. Color: White Material: Plastic Package Contents: 1 x Digital Decibel Meter Note: Light reflection and display differences may cause slight variations in color appearance. Measurement error allowance is +/- 1–3 cm.