Perimeter Trip Alarm，Trip Wire Alarm Device，Use 209 Primers, Early Warning Security System for Camping and Property Safety

My first time using one I was able to set it up and it worked. Used it a few times without any problems.

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I did not heed others reviews and bought four of them because they were cheaper than all others and I needed them ASAP for a camping trip in the back country with Bears. They were not reliable or even usable upon arrival, I suspected spring strength, travel distance and the blunted striker pin, luckily it was solved with just sharpening the striker point into a pyramid shape and they are now reliable (pictures included, I hope they help) I also upgraded the keeper chain with some broken mono fishing rigs I had and I am also using used, moss green 80lb power pro for the trip lines, attachment methods vary per application but one thing is for sure, the included eyelet screw is useless. Once the strikers were modified they all work reliably, the the other stuff I done is unnecessary but I like them even better because of it, 2 stars because they did not work upon arrival and the cost savings did not equal to the amount of time and effort to get them in proper working order. But they can be decent trip alarms if you are willing to do a little modification to them.

These ‘perimeter trip wire alarms’ are very popular, because they work. The trouble with most, are that they’re 12 gauge, and the blanks for those cost no less than $3 apiece. What makes this model so great, is that the 209 primers that this uses are much easier to find, much safer, and at about 8 to 10 cents apiece, MUCH less expensive.Another advantage is that you can carry a ton of them with you, and you can set up multiple wires. The space and weight in your pack is a fraction of what 12 ga. shells take up, which is huge.Loudness-wise, no, tiny primers aren’t going to make the same boom that 12 ga. blanks do, but they’re loud enough to alert you to trespassers, and even to wake you up if placed near enough.Operationally, it’s a breeze to set up, and will probably last forever. It’s all aluminum, except for the firing pin/plunger, which seems to be steel. Pull pin out, insert the trigger pin and safety clip, un-screw the end, drop in a primer, screw back together, and you’re set.One thing to mention is that I completely disagree with the “directions”, which are just a sketch of the device, with labels for the different parts. They say the “Trigger Pin” is the hairpin cotter pin, also known as a hitch pin or R-clip, and that the “Safety Pin” is the straight pin.Not so.If you were to try to set it up that way, the straight “Safety Pin” will just fall out whenever it’s tipped in that direction. There is zero resistance, because when the Trigger Pin is inserted, it makes the holes in the body of the device and the trigger plunger shaft perfectly aligned.But if you use the Hitch Pin for the safety, it grabs the main body of the device, and actually becomes a safety. The straight Trigger pin also stays in, because the spring holds tension on it. Bottom line – the straight pin is the actual Trigger Pin, and the bent one is the Safety Pin.I love this thing, and I’ll probably pick up a few more for full coverage when we camp.Hope this helps.

This flashbang tripwire alarm is highly useful, so long as it’s used with caution (no nearby flammables, dry leaves, etc.). The primers are easy to buy and use, and it’s good that this alarm has a safety pin as well as the trigger. The primers fire off about as loud as a “ladyfinger” squib-type firecracker and are easily audible for a long distance, so they give plenty of notice that something tripped the alarm. In my neighborhood, Coyotes are a problem, and they have no fear of humans since folks are careless with their trash. Some even feed them. They come right up onto porches. Well, this little flashbang does a great job of scaring them away! The only thing is that the tripwire must be set about 18 inches from the surface – porch, ground, whatever – or the feral Cats in the neighborhood trip the alarm (and yes, it scares eight of their nine lives out of them, too!). Spiderweb monofilament or 5# fishing line works great as a tripwire; strong enough to do the job yet nearly invisible. I prefer zip-ties for mounting the alarm, as the included screw eye takes up some of the stroke length of the firing pin, and zip-ties are cheap and allow me to easily relocate the alarm. Tip: if you intend to use multiples of these to secure a long perimeter, space them out no more than 100 feet apart. You can certainly go longer than this but then it takes a longer motion to pull the firing pin, and that longer motion may allow “whatever” to detect the tripwire and back off. Of course, you can also set the trigger pin so it’s almost all the way out of the firing pin, but you may experience false alarms. After you work with these for a while, you’ll be able to figure out what works best for you.Finally – and I just have to say this! – these are great little alarms, and ones that give you a lot of bang for your buck! 😉