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Bungle · 25th August 2006, 20:48

The key does send sound. Ultra sound is sound at a higher frequency than we can hear. The theory does work, but in practice...

25th August 2006, 20:48	#9 (permalink)
Bungle Rocketship door handle Join Date: 3rd July 2006 Location: SE London/Kent Posts: 1,220 Thanks: 0 Thanked 0 Times in 0 Posts iTrader: (0)	The key does send sound. Ultra sound is sound at a higher frequency than we can hear. The theory does work, but in practice...