I need an inexpensive receiver to hook up to a high intensity speaker (I'm thinking a smoke alarm speaker). I'm going to place it in another device (dvd player maybe) and mail it to myself in an attempt to figure out what unit in my apartment building is stealing my packages (the common area is locked and this has happened a few times now, once within hours of drop off).
Can anyone recommend a receiver that will run for a week or so without draining its batteries?
I'm thinking about just picking up an inexpensive R/C toy and pulling the receiver out of that but I need at least a few rooms worth of range and I am unsure how much power the receiver itself requires. Anyone know?
Thanks,
Dave