Here is another racing drone that you can use indoors or outside to have fun. It has GPS and visual tracking, so it locks onto objects and keeps your hands free. The drone can be controlled from your smartphone. It has a max speed of 6m/s and flies for 18 minutes on battery.
The Rabing RC Drone features a 3-axis electronic image stabilization system. It has geo-fencing, so you can fly it within a safe area with peace of mind.