The Blade MQX is a mini quad from Walkera that comes ready to fly.
It is small enough to use inside, as well as out.
It features Infrared Obstacles Avoidance, Ultrasonic Altitude Hold,
Six-Axis Stabilizing System, and Quad-Motors Driving System

Other features:
~can easily do front and back, left and right rolls~
~flight time is 5 to 7 minutes on a 3/7 volt 600mAh LiPo battery (included)~
~Devo 4 transmitter~
~the RX Firmware can update online (required UP02 upgrade cable and adapter)~

All Content Copyright 2002,
Scott L. Golden
--All Rights Reserved--
Update on this model: I would not recommend this one.  I ended up disconnecting the avoidance system.  Indoors you end up fighting it too much.  Maybe if you were in a huge area it would be fine, but that's not the situation here.