SABRE 120 dB Wedge Door Stop Security Alarm, Extremely Loud Wireless Alarm Siren Audible Up To 1,500 Ft., Non-Skid Pad, Compact Alarm Great for Home, Travel, Apartment or Dorm

These are great and loud! Perfect for serving its purpose! Con: when you turn it on, I wish the little light stayed on, so I would know that the battery was still working and that the wedge was in the on position when I’m in the dark.

It works really well. Just make sure that you don't turn the switch on before you put it under the door. You will have comments from the other rooms in your hotel lol. It's really loud.

The alarm system is awesome! It is so loud It should wake me up at night if someone tries to break in. It’s easy to put in place. Gives you an added sense of security.

Easy to use, loud alarm, a little large for travel but safety is important.

Alarm is extremely loud and provides an easy setup and can be added to any travel bag

Sound quality great. Easy to install. Size perfect. Easy to travel with especially with TSA Precheck. Quality good. Alarm function.

I'm very happy with this unit. The alarm is very sensitive so be careful, it can wake the dead. VERY LOUD. But that's what i want, as I have an elderly parent who is starting to wander, and can leave when I'm sleeping in the middle of the night. Also not a great area for breakins. First I bought a cheap version of this which didn't work AT ALL. Only about $2 more for this and I feel much better.

I bought this thinking it was like the others we have, which make noise when you press them but stop when they are let go. These only have an on/off switch, and once it's on if you press them on accident they will not go off until you switch it to 'off'. I had given one to my dad to use, but after triggering it the first time and realizing it never goes off without manual input, I told him to just throw it away and I'd get him a different one. My dogs live with him and we both agreed it's not a good solution for someone who has pets. Pros: Does work. If it's just me, I use this in front of my bedroom door at night. Very loud! Cons: Must be switched 'off' to get it to stop making noise - this kills the ears because you have to be so close to it. Very un-friendly for animals because of the above. Imagine you accidentally leave it on, your dog somehow triggers it, and you're not back home for hours. For that reason I can't recommend this for pet owners.

Objet qu'il faut posséder absolument ! J'étais septique, mais plus maintenant ! Vous entendez l'alarme à plus de 100 mètre ! Très forte résonance tout le quartiers entends ! En plus de bloqué la porte ! N'hésitez pas ! PS : Prévoir une pile de 9V ! Dommages qu'elle ne soit pas fournie ! Mais vu la qualité de l'appareil, aucun soucis !

Took this on touring holiday of Vietnam and Cambodia and as two women travelling we definitely felt safer in our rooms, would use when staying anywhere UK included, set it off by accident a couple of times when forgot it was under the door and it is really loud!!!!

Suena extremadamente fuerte. Detiene la puerta muy bien. Muy buen producto

VERY Loud door alarm. However it somehow ran out of battery after one use as it was travelling in my backpack

Purchased these for traveling, as I assume most do. We've used them for close to a year now in hotels both in Canada and the US, and Air BnB's. They work in two ways: 1) The metal plate completes a circut which trips a loud alarm 2) The wedge shape allows for blocking of doors that open inward by jamming the door "up" and binding up the hinges, barring physical entry. This is dependent on a few factors: The door opens inward The door is at a proper enough height to facilitate such an action The floor surface is grippy enough to not allow the device to slide. They work absolutely well, with a few caveats, but first the positives. Pros: The are loud (almost debilitating in small rooms) , don't take up a lot of room and are pretty simple to use. Cons: They won't fit under all doors due to the height of them. Some doors are too low, others too high. On some surfaces they will slide, because you can't get a good wedge because pushing it too far under the door will trip the sensor. By attaching two together with an elastic band, I have managed to make them go off, but not block the door to an effectiveness level that I felt comfortable with. They would work well for waking occupants, provided those occupants are prepared to do something about those person or persons are gaining entry. As a simple stand-alone deterrent, I'd rate them on a 3/10. They won't stop someone determined to gain entry, but they will keep the honest crooks or mistaken housekeeping away with no issues. For improvements on these I would like to see a method of attaching a tripwire/string to them that can allow the same action of a door opening and depressing the metal trigger to trip the alarm. This is useful for times where they won't fit under doors, doors that open outwards (but you'd still like to know when they are opened). Upgraded and expanded grippy material on the bottom to facilitate better sticky action on floors all in all, if you're someone who wants extra piece of mind, one or two of these in your bag is never a bad idea.