An automatic ball catcher
A flying car with beds inside and a private masseur.
A time machine that lets you know what will happen in the future, like if the earth is going to be wiped out and how to save it.
A teleportation device so we can teleport ourselves.
Wireless headphones that you can use voice control to turn on and off.
Mobile phone cases with solar panels to charge the phone when the case is on.
A tower to provide free internet all over the world.