Water/leak detectors?

I'm looking for small (the smaller the better) battery-powered leak detectors, that can either send a signal wirelessly to a central unit if water is detected, or that can sound an audible signal themselves. I'm not bothered with integrating it into anything existing, so I'm flexible with the setup, except there must be as little wiring as possible. There's some X10 stuff available but either sensors have to be wired together or it'll work out somewhat expensive with an SC2800 and each detector at £80/piece.

Something like these would definitely do the job:

But if small sensors like this could talk to a central alarm unit wirelessly that would be great. Any experiences with this would be greatly appreciated.

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