This mouse fits in the palm of your hand

...almost anyway

Almost completely populated

Ultra low profile design

JTAG first...

Good look at the ground clearance

Front IC layout

Has the name tattoo'd right on it

Switches, buttons, LEDs, and an SPI header

Passives, regulator, and H bridge on the bottom

Nordic 2.4 GHz radio mounted up

A chip antenna might be more appropriate!