So I went ahead and took apart my cordless phone and stripped it barebones, wrapped it all in electrical tape to make it look pretty much like a bomb My own mediocre attempt at humor has been highly amusing to myself.. I noticed that it takes a 9v jack, now if I wanted to make a beigebox out of this to spy on the neighbors from my house, how would I be able to power it? Could I use a standard 9v battery? And if I could about how long would it last?