HS-DSA

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.

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.

It's simple, it's effective, but proper functioning depends on your floor surface. For those who don't want to read thru the end....Conclusion: This is a great and simple solution to keep people from entering your home, while you are at home. But you have to buy additionally a 9V block battery, need a micro screw driver to place the battery and you have to buy a simple fastener solution (see below) for slippery floor surfaces (e.g. wooden floors, stone or tiles) Delivery: I bought it on Amazon. Delivery was this time one day late. Opening: The packaging of the Alarm is tricky to open. Its completely blistered. This is not very Eco-friendly and you need strong household scissors to open it. Content: Just the Alarm, A short 1/4 page instruction. NO battery included. you need to buy a 9V block battery separately. Installation / Functioning: First you need to buy extra a 9V battery... if you realize this only after the packaging arrived, this might be quite bothersome as many households will have AAA or AA batteries always at home but not 9V block batteries. The installation of the battery requires a micro screw drive. A normal screw driver will not get you far as you wil just damage the screw head. Battery once installed you should be good to go. The alarm is loud and it works very effective. But I have a wooden floor and the device always slid away when opening the door. The rubbers on the bottom would hold strong enough to the ground. So I bought this Scotch Reclosable Fasteners, Clear, 1 x 3-Inches, 2 Sets (RF9730) to hold it strong to the ground and the door cannot slide it away. ==> this works perfectly. 1) The door is completely and very tight blocked! This keeps intruders from entering your home AND 2) you can remove the alarm easily while this scotch fastener consist of two parts. One sticks to the floor and the other to the alarm and you can peel the device off any time easily from the floor. 2) The alarm goes safely off if the door opens and cannot be switch off by the intruder - given you have placed the alarm fixed to the ground with the fastener close enough to the door. Final rating: As the obligatory 9V block battery is missing and additional investment into a fastener solution for slippery surface is needed (depending on your home) i can unfortunately only give 4 stars. Once installed properly it works perfect. Open question remaining: How long will the battery last?

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.

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

This thing is FABULOUS! Very easy to use. Just turn it on and sit it on the floor at the door (like an old-timey door stop) and if the door is opened, the alarm goes off. And it is very loud and "alarming." Would make any intruder flee the scene immediately. No joke. If you live alone, a must have.

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.