GoPro has launched its long-anticipated drone, named Karma.

The firm's chief executive Nick Woodman - who is nicknamed the "mad billionaire" - said it offers owners the chance to take Hollywood-style shots.

But the loss-making firm is entering a very competitive market.

The BBC's North America technology reporter Dave Lee was one of the first to try out the new aircraft as well as the firm's new voice-controlled action camera.

Read more