Jee…..what’s that .. ?

These are Arduino compatible wireless modules called JeeNode’s.
They are designed by Jean Claude Wippler and you can buy them as a kit through his shop.
There is a pre-assembled version with an USB connector called JeeLink, very nice for the receiver side of a JeeNode based network.

JC also programmed some nice libraries for these boards but you can use these libraries also on a combination of a regular Arduino and a RF12B transceiver module.

So why these modules instead of XBee, Bluetooth, 433 Mhz modules or 2.4 Ghz modules ?

Of course it depends on what you need. But if you are looking for simple, stable, low power and cheap RF modules you should choose these. The nice thing about the JeeNode’s is that they have the RF module on the board. So no stacked protoshields for the RF.