The thing that always got on my nerves was that when these go off EVERYONE knows where it is AND that you're using it,
so its not practical for sneaking up on someone, or even pranks where you need to tell when someone is coming.
I will show you how to fix that. i will show the finished product above.
the first thing we need is an alarm. The type of alarm we will use is shown above. These are relatively cheap, as i got mine for about $5.00 (on sale) You can buy them at most toy stores.
The second thing we will need is a length of speaker wire (I used 10ft.)
Soldering Iron OR Duct Tape
The last thing is a LED (Light Emitting Diode), you can use whatever color you want.
and strip the insulation off the ends and solder it to the speaker connections on the board. (For no solder version duct tape the speaker wire to the other wire from the toy). Now just attach the LED to the speaker wire.