Compact, battery powered wi-fi device senses, monitors and alerts you via text, email and push notifications * Alerts for Temperature, Humidity, Impact/Vibration, Light (On/Off), Door (Open/Close), Internet Connection and Battery Levels * Elertus easily protects any safe, gun safes, server room and computer rooms, greenhouses, growing areas, coolers, medical fridges and freezers, sheds, storage units and lockers and more. * View and control sensor readings from anywhere at anytime using the free Android or Apple apps or Internet Browser * Use it FREE. No monthly fees or subscriptions to pay! Made in the USA