If you want a really good audio player with lots of features and kick butt sound, go with the AP-16+ from EFX-TEK.com for $129.
You can use a $10 Parallax PIR sensor which will connect directly to the AP-16+. Use 1 or 2 6x9 car speakers for awesome SFX.
You can power everything with a 12V battery like this for $15:
http://www.ebay.com/itm/NEW-12V-7AH...n-Fios-More-/121459962657?hash=item1c4793f321
This will give you a completely stand alone prop with no wires running to it.
You can use a $10 Parallax PIR sensor which will connect directly to the AP-16+. Use 1 or 2 6x9 car speakers for awesome SFX.
You can power everything with a 12V battery like this for $15:
http://www.ebay.com/itm/NEW-12V-7AH...n-Fios-More-/121459962657?hash=item1c4793f321
This will give you a completely stand alone prop with no wires running to it.