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The Easy-Radio (ER) ERx00TS Transmitter, ERx00RS Receiver and ERx00TRS transceiver incorporate
‘Easy-Radio’ technology to provide high performance, simple to use radio devices that can transfer data over
a range of up to 250 metres Line Of Sight (LOS). http://www.lprs.co.uk/
A small board that acts as an IR receiver and a high-powered transmitter. It's small and light enough to hang off of a serial port, doesn't need batteries, and has a transmit range on the order of 10 meters.