Aren’t we all looking for inexpensive ways in order to have wireless communication? This is what this product is about.
We use a very smart way for that, basically, a transceiver having an ISM band FSK module is implemented with a unique PLL, and such modules apply to the FCC as well as ETSI regulations and are used to operate under a specific MHZ which is 434MHZ.
Regarding the voltage range it supplies, it really is between 2.2 and 3.8 VDC. What’s used to send data and configure the RFM12 module is an SPI interface. Check out the documents and Datasheet provided for more information.
Dimensions: 15.9 x 16.1 mm (0.626 x 0.634 in)
Product pictures are of Sparkfun.com