Meet the WhiteShark MixPro: an underwater scooter for all your adventures in the ocean or sea. It can reach speeds up to 4 mph and lasts up to 60 minutes on a single charge. The MixPro has a smartphone / action camera mount, 2 speed options, and replaceable battery.
The device weighs 3.55kg. It is rated to a depth of 40m. You can find out more about it here.