>   Anyone have a favorite device?

Depends how much trouble you want to go to, circuit-wise,
power requirements, cost etc

http://home.clear.net.nz/pages/joecolquitt/txless.html

I use those for, amongst other things, a long-range (15m)
outdoor camcorder remote, 5m 2-door sentry and general
purpose data comms. If you look through catalogues, RS
for example, there are many Rx-Tx diode-detector pairs

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