The Beetle is an ancient remote-controlled drone that you can control mid-air to hit distant objects from various positions or retrieve small objects.
Unlike the Slingshot, which only fires in a straight line and has limited range, the Beetle can fly freely around and can even travel through narrow and curved tunnels.
However, be careful not to bump the Beetle into walls etc. or you’ll have to start all over. Also, there is a limit on the flight time–and if you try to fly too faraway from Link.