Essentially, this homegrown cat door was crafted to only open when Gus or Penny walks up with their super special RFID tags; once they approach, a mounted camera snaps a picture and uploads it (along with a quip) to Twitter

The RFID Guardian Project is a collaborative project focused upon providing security and privacy in Radio Frequency Identification (RFID) systems.

Hitachi unveiled a tiny, new “powder” type RFID chip measuring 0.05 x 0.05 mm — the smallest yet — which they aim to begin marketing in 2 to 3 years.