This mini quadrocopter would make a great spy
This little guy weighs only 20 grams and measures 8 centimeters from motor to motor. It runs on a Cortex-M3 CPU that takes input from an accelerometer and uses a couple of gyroscopes to keep balance. The quadrocopter is controlled by a 2.4Ghz radio transmitter, uses a small 110 mAh LIPO battery pack from an R/C plane and uses a PC to handle the telemetry.” via Hackaday

