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 reflect the human ear's sensitivity to low-intensity sounds, making it suitable for ambient noise monitoring. Precision Measurement: Offers a sound level range of 30 - 130 dB with ±1.5 dB accuracy, 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 variables, a deviation of 0–15% in readings may occur under certain conditions. Long-Lasting Battery Life: Powered by a built-in 2000mAh lithium-ion battery, providing 3 to 5 days of continuous operation and up to 7 days on standby. Ideal for extended use in studios, classrooms, and industrial settings. 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 factory calibrated and tested before shipping. The battery may not be 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: Other items shown are not included. Slight color variations may occur due to lighting and display differences. Measurement error allowance: ±1–3 cm.