Smallest self-powered steering flying robot

The smallest self-powered flying robot is "Piccolissimo" (Italian for “very small”), developed by researchers Matt Piccoli and Mark Yim at Penn University, USA. Revealed in May 2017, Piccolissimo has a 39-mm diameter and is 19 mm high. It is fully manoeuvrable, i.e., it can steer and fly in different directions. Because of this, it is also sometimes called "Maneuverable Piccolissimo". Its power is supplied via a battery and commands are sent wirelessly to an on-board micro-controller. Including batteries, it weighs about 4.47 g.

A smaller version of Piccolissimo, "Mini Piccolissimo", has a diameter of 28 mm and weighs just 2.48 g. This smaller version, however, it is not fully manoeuvrable and can only be controlled in a vertical direction.