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 shut-off without operation after 10 minutes, convenient and energy saving. Multi-function: 30-130 dBA measurement range. 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 Specifications Measurement Range: 30~130dBA Accuracy: 1.5dB Resolution: 0.1 dB Frequency range: 31.5Hz ~ 8KHz Frequency weighting: A Sampling frequency: 2 times/second Microphone: 1/2inch electret condenser microphone with auto shut-off Low battery indication maximum hold function operating conditions Temperature: 0~40c Humidity: 10~80% RH Storage Conditions Temperature: -10~60C Humidity: 0~90% RH Power: 3 x 1.5V batteries (included) Dimensions: 49x 33 x 159mm Quantity delivered: 1 piece