What can I use to transmit noise?

baby monitor app for ipad image

Spar

Well long story short, I'm scaring my friend. She's my neighbor and I live in the house next to her. Basically I need something that can make noises and can be controlled from another place. I considered a baby monitor (too expensive), or some kind of walkie talkie (probably not loud enough). If there is an app or something I have an iPad or iPod touch I could leave there. There is wifi there and the house next door is within less than 10 yards away so if its some kind of radio, i can here it.
@zachary I would leave it in her closet or attic since her roommate is in on it she could help and make sure she wouldn't break it

Answer
I wouldn't leave an iPhone/Pad outside... If you have a friend or something that you can borrow a home theater system from, you could put one of the speakers outside facing the other house and control the volume and sounds from inside with the amplifier.

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