AC Weighted db Meter The decibel meter employs a condenser microphone to measure sound levels ranging from 30 to 130 dB A 35 to 130 dB C, with an accuracy of 1.5 dB, and covers frequencies from 31.5 Hz to 8,500 Hz Easy to Read The LCD backlight screen of the sound level meter visually displays the noise data changes Max value. You can switch between fastslow time weighting or freeze the current reading as needed. When the volume exceeds the set alarm value, the indicator light and screen of the sound level meter will change color to alert you according to the noise level RealTime Monitoring Recording The sound pressure level SPL meter is capable of storing up to 43,000 sets of data and import the data saved to a PC via the USB port for realtime data sampling and analysis, data downloading, printingchartsdata reading, and deletion. Additionally, you can set the date, configure an automatic shutdown time, and low battery indicator to remind you when its necessary to recharge Lightweight LongLasting This noise level meter features nonslip rubber grip and weighs just 4.23 ounces, making it convenient to carry around. The decibel meter boasts 14inch mounting threads on its back for attachment to a stand, and can stay in standby mode for up to 8 hours after a 1.5hour charge for extended monitoring What You Get 1x Benetech GT1355A decibel meter, 1x USB port, 1x user manual, a 12month warranty, and friendly 247 customer service our customer support team stand ready to assist you. Note The db meter is well calibrated with the standard of 94 db 1kHz at factory before shipment.