XIANQI Product Description: Quantity: 1pcs Color: black + yellow [ Portable Sound Level Meter ] A practical little tool great for noise pollution monitoring, home theater setup, health and safety compliance, vehicle noise testing, etc., [ HD Digital LCD Display ] Larger legible LCD display with backlight,which can quickly show the measurement, clearly and easy to read. [ Power Source ] Power supply is 3 pcs AAA batteries (Included), low battery indication, auto power off without operation after 10 minutes, convenient and power saving. [ Multi-function ] Measuring range is 30 - 130 dBA. Maximum/Minimum/Data hold function; Auto power off; Battery indicator: Check the remaining battery directly. [ Widely Application ] Designed to meet the measurement requirement of sound quality control in various environment.Ideal for testing music recording, neighbor noise complaints, industrial settings, office settings, speech therapy more.