Keep your valuables protected from the damaging effects of temperature and humidity with Lockdown Hygrometers. The state of the art technology shows the current conditions and even records the historical max. and min. values. Use the Wireless Hygrometer with Remote Sensor to keep an eye on conditions inside a vault or cabinet. Product Features MONITOR TEMPERATURE AND HUMIDITY FROM BASE UNIT AND REMOTE (REMOTE DISPLAYS CURRENT HUMIDITY AND TEMPERATURE) RECORD MIN/MAX VALUES FROM BASE UNIT AND REMOTE WIRELESS CONNECTION ILLUMINATED SCREEN WITH MAGNETIC MOUNTING OPTION BATTERY POWER (AAA BATTERIES INCLUDED)