BackLCD backlight: allows clear and easy reading even in the dark. Sampling Fast / slow sampling: free response selection, press the button to perform 125ms fast analysis and 1 second response rate for higher accuracy. ~ 30 ~ 130dB measuring range: provides accurate data of the sound level in your environment. Min / Max function: allows you to take into account the minimum and maximum sound decibels of your environment at any time. 1/2 inch condenser microphone, capable of withstanding an impact of one meter. Product This mini sound level meter is ideal for measuring and monitoring noise and sound in any environment. It has more compact design and easier to use compared to traditional meters and so on. It is lightweight, compact, ergonomic and user-friendly, making it an excellent tool for monitoring noise levels in hotels, conference rooms, home theaters, hospitals and all other noise sensitive environments. Specification: Condition: 100% brand new : UNI-T Functions Range Resolution Accuracy Noise (A weighting) 30 ~ 130dB 0.1dB 1.5 dB Sampling rate FASH 125ms SLOW 1000ms Overload indication OL MAX / MIN MAXIMUM MINIMUM Data retention Hold LCD backlight YesAutomatic shutdown 5 minutes Low battery indication 3.0 ~ 3.5 V Battery 4.5 V Current consumption Work mA 40mA Switch off uA 10uA Work environment Temperature0 ~ 40 Humidity80% RH Storage environment Temperature-20 ~ 60 Humidity75% RH Battery: 3 x 1.5V AAA batteries (not included Size: Approx. 150 * 50 * 27mm / 5.9 * 2.0 * 1.1 Package Weight: Approx. 132g Package included: 1 * Sound Level Meter