DANOPLUS 13 INCHES DECIBEL METER DATA LOGGER: Decibel Data LoggerDANOPLUS decibel meter can record decibel data every 2 seconds, its able to store ONE YEAR data and display and export realtime data for analysis when connect to software in PC 13inch HD ScreenThe noise meter is designed with 13 INCHES HD Display, each digit number has 4 inches big, you may monitor the sound level clearly even from far away Audible Visual AlarmThis classroom noise meter will emit Audible and Visual alarm when the decibel level reach the decibel thresholddefault is 120dB, you may manually adjust the decibel threshold and alarm duration time 16.4FT Sound SensorDANOPLUS wall mounted sound decibel meter is equipped with 16.4 feet extra Long sound sensor, you may detect all of the sound source around based on your need MultiFunctionalThis noise monitor is Desktop and Wall mount design, decibel level analog bar indication, 12V external alarm output with 3.5mm port, 30130dB measurement range