Small and easy to pack, it’s the Lewis N. Clark Travel Door Alarm. These type of devices have been around for a while, but now they’re more compact and feature a built in LED flashlight. They’re very simple to use. Just hang it on the hotel door, slide out the builtin thin metal prongs and stick them in the door jamb. Then, if someone opens the door, a loud, high-pitched 91db alarm sounds. It will wake you and most likely scare an intruder away. Under $15.00

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