I'm searching for an bistable RF remote control switch with key fob.
All i can find are normal relays like:
It doesn't matter what protocol it is.
I could build one with RFM12 or RFM69 but there are no key fobs for them.
Adafruit has this receiver and remote:
But it looks like every remote can control every transmitter.
No, there are address selection "jumpers" on both TX and RX. Back of RX, lower right:
some thing like this???
if has 3 configurable working modes according to the spec:
Working mode: Momentary, toggle, latching time delay (5s ,10s ,15s )
(its not the only out there! 
)
Also if ur really struggling and ur up for some soldering, why not just add a 555 bistable circuit to something like above?
On the Adafruit website they say: There's no programming, configuring or addressing.
That is the same like the one i showed. That is not a real latching relay.
A latching relay doesn't need power after switching:
A latching relay, also called impulse, bistable, keep, or stay relay, or simply latch, maintains either contact position indefinitely without power applied to the coil. The advantage is that one coil consumes power only for an instant while the relay is being switched, and the relay contacts retain this setting across a power outage.
What they mean is "none required".
The jumper tabs shown in the photo (post #2) allow you to specify a device address. See the PT2272 data sheet
so that's what your after then...
We you can simply purchase one from RS for example and add it to the output of the kit OR replace the relay on the kit. it's not rocket science but just some circuit tinkering!
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