This reliable and powerful alarm will give you peace on mind whether youretraveling or staying at home. With a motion sensor that triggers the alarmwhen someone has opened the door, it can be used in college dorm rooms, athotels and hostels, or even at home.With two lithium button cell batteriesincluded, it comes fully operational and ready to use. The sound intensitylevel of 91dB is loud enough to hear throughout the room and will startle theintruder. No one will be able to get in or out without you knowing.Its easyto set up: while holding the thin blades together, simply slide them into thecrack between the door and doorframe, then loop the cord around the doorhandle and adjust the toggle to keep it in place. Lastly, set the alarm. Thissame technique can be applied to sliding doors or to windows as well. Nomatter the situation, it will alert you to a possible intrusion.Additionally,the built-in bright LED flashlight allows you to see your way around in thedark without having to turn on lights. As a compact, lightweight option, itwill also take up very little room in your suitcase or handbag.If you haveloved ones that travel, you travel yourself, or youd like an added sense ofsecurity at home, youll sleep better with this do-it-yourself protectiondevice knowing that others cannot gain unauthorized entry without setting offthe alarm.