Portable Sound Level Meter: A handy little tool ideal for noise monitoring, home theater setup, health and safety compliance, vehicle noise testing, etc HD Digital LCD Display: Large readable LCD display With backlight, which can quickly display the measurement, clearly and easily readable. Power source: 3 AAA batteries (included), low battery indicator, automatic shutdown without operation after 10 minutes, convenient and energy saving. Maximum\/Minimum\/Data Hold Function - Auto Power Off - Battery Indicator: Directly check the remaining battery. Widely Uses: Designed to meet the measurement requirements of sound quality control in various environments. Ideal for testing music recording, neighbor noise complaints, industrial settings, office settings, voice therapy and more. Product Size: 49 x 33 x 159 mm Quantity delivered: 1 piece