The MicroFly Tiny R/C UFO is strictly speaking not unidentified, so really it’s an FO. But someone in marketing clearly thought that the product needed va-va-va-vroom. Anyway, it’s small, green, hovers like a crazy hovering thing and flies for 5–7 minutes on a 10 minute charge. You’ll need a truck full of AA batteries though (OK, six), so be prepared for some running costs. $19.99.
With a diameter not much larger than a silver dollar and a single propeller on the bottom, the MicroFly somehow manages to hover in the air as it spins and flashes its blue LED. The simple slider control allows only up-and down movement… but this makes it so easy to fly that anyone can instantly control it. Buy a few and create your own buzzing alien insect swarm… they use the same channel so you can control multiple MicroFly units from one remote.