This e-bike for 4-year-olds can do 15 miles an hour, costs $1,300 – and sold out in a month

• E-bike company Super73 released a bike for kids that can go up to 15mph and costs nearly $1,300.
• E-bikes have exploded in popularity, but accidents and battery fires are also on the rise.
• Super73 CEO LeGrand Crewse thinks that starting kids at a young age can create responsible riders.

California e-bike company Super73 wanted to make a bike for kids that's more than just a toy. It came up with an electric pedal-less bike for 4 to 8-year-olds called the "K1D."

It can go up to 15 miles an hour on any terrain, comes in four colors – and costs $1,295.