These Devantech modules make up a very easy to use radio telemetry set for your I2C devices.  The main module (RF04) is powered from the USB bus, so it needs no external power supply or batteries.  Just plug it into your PC and it will appear as a COM port.  The RF04 module set can be used by anyone who can program a PC to use the COM ports.  Don't forget the USB cable we sell them too.

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RF04 & CM02 Wireless Transceiver Pair	RF04 - USB Telemetry Module
RF04 Schematic	CM02 - Radio Communications Module

The RF04-900 uses the LPRS EasyRadio ER900TRS transceiver at 914.5MHz with a power output of 1mW. We were able to get reception throughout our shop and office through several walls with no problem (>2000 sq ft).  The Data Rate of the telemetry set is 19200 bps!

Additional application notes, schematics, and tech support can be found at RF04 -USB Telemetry Module.  For the CM02 follow this link.

For further technical information on the transceiver, visit the Low Power Radio Solutions (LPRS) website Easy Radio transceiver page.