Upgraded Door Stop Security Alarm with 120DB Siren Door Stop for Home Travel 3 Portable 120DB Entrance Alert Door Stop Alarm for Travel Home Apartment House?3pcs?

They might pick your lock but they cannot get inside your hotel room, apartment, or home when secured by the Super Stop Alarm. With box package which protect the product well Battery Installation: Make sure the on/off switch is in the "off" position. Turn the unit upside down and open the battery compartment Install one 9-volt battery (not included) and close the compartment. The on/off switch will prevent the unit from accidentally sounding. Requires one 9 volt battery - not included Note: The gap between door bottom and floor should be 1 - 3.5cm