Bluetooth Tracking Device...

Right, this is just a query really, I know a lot of the time, im leaving my phone either in the shed, garage, or somewhere in the house.

then i was thinking the other day.

is it possible to get some kind of tracking device? which will locate a bluetooth device determined on the signal strength?

i know with Wifi you can check a signal strength, and work out if your further away or closer.

it would be pretty handy, as i always have my PDA on my desktop, and my phone wherever around the house, i spend hours looking for it sometimes, (and i always have it on silent, so ringing it does'nt help)

anyways, if anyone has any information on this, ide really appreciate some help.

thanks!