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The JeeNode Micro is the little brother of the JeeNode - the main difference is that it's based on the ATtiny84 processor and has only 2 ports instead of 4. It's also considerably smaller: 16 x 48 mm, and less than 4 mm thick due to the use of a thin PCB and an extra-flat version of the RFM12B wireless module.

Software development can be done with the Arduino IDE - but this does require some extra hand-holding and software support, see the Arduino-Tiny library and this project for more information on how to do this. The JeeNode Micro (or JNµ) is currently aimed at advanced developers & makers - you will need an ISP programmer to upload the firmware and there is no hardware software support to debug or communicate through.

The JeeNode Micro normally runs at 8 MHz, and the RF12 library has been extended to work with the ATtiny84 (it'll work down to 4 MHz).

JeeNode Micros are shipped with the ISM-band 868 MHz radio module for use within Europe.

The unregulated JeeNode Micro is pre-assembed and the best choice for battery-powered use. It does not include a voltage regulator, and needs to be powered by 2.2 .. 3.8V, such as 2x AA batteries, or a LiPo battery with forward-drop diode, or the AA Power Board.

The regulated JeeNode Micro is pre-assembled and in addition includes the same low-drop / low-power regulator as other JeeNodes (on the back of the PCB). It can therefore be powered from 3.5 .. 13V (higher voltages will limit the amount of available current - the preferred input range is 4..6V).

The PCB only variant is the bare board without any components. You’ll need to add your own ATtiny, RFM12B, pin headers, and a few other components to create a working JeeNode Micro. This board contains SMD parts of size 0603 – you will need to use proper SMD tools and soldering techniques to assemble a JeeNode Micro yourself.

The documentation and full design details are freely available.