Works as advertised. Gave one to a neighbor in her 20s whose crazy landlord kept dropping in unannounced. She said it worked to block his entrance and they both heard the loud screech of a burglar alarm. I just bought one for myself and will take it with me when traveling as I have woken up way too many times to the sound of someone trying to break into my room in the middle of the night. We tested that at home too. I have concrete floors with a LL Bean rubber mat at the entrance and this wedge is high enough to stop the door where others have not. Highly recommended for both safety and peace of mind. Would recommend wearing earbuds for initial setup and testing (wanted to know how it sounds). The alarm is as loud as my commercial security system. Easy to use. Highly recommended.
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