The Mu-chip (µ-chip) is Hitachi’s pioneering contribution to smart tag technology. It is a radio frequency identification (RFID)
microchip that is small enough to be embedded in paper.
By using semi-conductor technology the Mu-chip provides micro-size data storage that can uniquely identify,
track and authenticate any size of object.

The Mu chip can have an onboard or external antenna and being a passive tag requires no battery,
thus enabling a very long lifespan.
The Mu Chip has a 128 bit read-only memory capable of storing 10**38 unique IDs and operates at 2.45GHz frequency.
The current dimensions are 0.4mm square and minimum thickness of 60 microns, however there are plans to reduce this further.