Epson unveils better version of world's lightest flying micro-robot Wednesday, August 18, 2004 at 16:13 JST TOKYO — Seiko Epson Corp said Wednesday it has developed a more advanced successor to its flying micro-robot, the world's smallest and lightest. The new model features fully wireless control and has two tiny ultrasonic motors that drive two propellers in opposite directions for lift. Epson said the model, which is about 136 millimeters wide, 85 mm tall and weighs 8.6 grams without the battery, will be on display at a fair to be held Aug 27-30 at the Tokyo International Forum. (Kyodo News)