Four wheelers that were designed for kids are very similar in design to regular adult ATVs. They are, however, smaller in size and have less power in comparison. Some models rely on rechargeable batteries and need to be plugged into an electric outlet for a few hours in order to charge them. Others run on gasoline and have larger engines and bigger seats to accommodate teenage kids. Different models cater to different age groups and are equipped with the necessary safety features. Some of these features can be remotely controlled by parents. Some four-wheelers were designed for backyard use while others come with treaded tires and a powerful motor for muddy and sandy terrain.