Lets go "PYRO"! Sounds scary, right? (Not from me! Never...) I'm easy! Ok, some of you may have seen those small "party poppers" you can buy almost anywhere today... They look like mini-champagne bottles,( multi colored plastic) have a single pull string, and they "pop", shooting out confetti strands of fine paper into the air...Yeehaw! But you can make them work for you, and have a really good signalling device in the end. I do NOT advent the use of anything that can do harm to anyone or any animal..( NOW That's illegal!) Now days you can get about a dozen of these for a dollar or more.... You can use these as is, but they are not very useful that way... I remove the cardboard disc at the bottom, then dump the coils of paper confetti out, then I remove the next cardboard disc. There is a small (miniature) firecracker inside. You can't pull it out! ( it can be reomoved but no need to do that)You can now use this as is, and tie it to any number of things, but be aware they are NOT waterproof! (seal with wax or silicone!) You can lenghten the pull string by tying ( it's a real pain!) a longer piece of string to the original, or by gluing one to it. ( easier for us guys with big clumsy fingers!) You tie the "bottle" (around the "neck" area) to a tree, a limb, a rock, whatever, and then gently stretch and tie off the pullstring to a secure place. When the string is pulled, you get a nice report. You can "modify" these, as I have mine, but I HIGHLY do NOT recommend for YOU to do so. My land area is so large to cover, that I need a bit more "pop", to become a real "bang", Goex/Pyrodex gets me there! ( besides I have severe tinitis hearing loss!) I load the bottle with 50 grains, re-cover with the 2 pieces of carboard and epoxy it closed on the bottom. It is fierce. It is loud and makes a heck of an orange blast. Again, I do Not recommend that YOU do that! I've been doing this since I was 11, and yeah, I'm CRAZY! ( wonder why I have hearing loss now?) Another device is made from what is commonly known as: "boobytraps". (purchased very cheaply for many, on the net) Those are the 2 string type of firecracker/popper type of device. Still legal, so far anyway.( but they may not be too much longer) They are usable right out of the box. They are easy to use and set up. I like to add more string and tying more on is still not easy. So I epoxy additional line to the originals. Then you can put them all over the place and unless you have headphones on, are listeining to heavy metal, and oblivious to any other sounds around you, they will get your attention, especially at night! They are NOT huge by any means but they'll work! And of course, I have modified several of them. I use old empty aspirin bottles with the snap on or screw on lids....I drill (tiny) holes in the tops and bottoms....feed the strings out and load the bottles with all sorts of stuff! I tried flour once and that was fun, but not really what I wanted, so I added some 50 grains of Goex/Pyrodex, then sealed them with epoxy. The strings and holes can't be glued, so I use wax or silicone to make them waterproof. These are NOT toys. They are as real as a concussion device. They are very loud, very bright, and they put out a lot of white smoke too! These could easily remove a hand, in a heartbeat! I have modified some to not only use the Goex/Pyrodex for extra bang, but also as a delivery device to put a lot of cayenne pepper mix in the air...makes one heck of a cloud ( about 12 feet wide and 6-8 feet high). Man that realy keeps them coyotes at bay! Now, you could buy those 12 gauge units they sell, that can (supposedly) only use blanks....Those are dangerous, by any and all means. They will fire LIVE rounds and they can kill a person closer than 20 feet or more in a direct line using ONLY blanks! The shells wadding can, has, and does kill! Now you can find many places on the internet that sell some types of fireworks,some are already made, some you have to make. (It's best to have some real chemistry background though!) I found some that are not only smokes, but also have whistles as well! Now there's a device! They are great to set up in all kinds of areas. Personally I like 2 types combined...Audible: a report/bang/pop, or a shrill whistle and visual as well, such as smoke or even a ground flare or sparkler types. (Some are pullstring types, some require a fuse to be lit, all easily done, even if by electrical firing systems.) That way they work both day and night. You will see or hear something! Sure, the bad guys will too....That's the BEST part! The Psychological impact is fantastic! Can you imagine trying to sneak up and into an area, only to trip a device that shrieks like a banshee, and also sets off huge amounts of smoke or bright light? You'd wet yourself! ( See? I didn't say the bad thing!) I like that in a device! Nothing like loud sounds and brilliant lights to scare the pants off an intruder! Some freak out at the sight of smoke! Use your imagination! I also love to use aerial devices, (rockets), that shoot up screaming a loud shreik, putting out fantastic amounts of sparks and so on...you can even put a top on that makes one heck of a report and lots of pretty lights! Life is good!