Voltorb are aggressive red and white ball shaped Pokémon that looks strikingly similar to a Poké Ball. Although it was discovered shortly after Poké Balls were invented, some believe there is a connection. Though roughly ten times larger, many trainers get a surprise when they pick one up thinking it is a Poké Ball. When jarred or angered, a Voltorb can and will explode, causing massive damage to their aggressor and themselves. It is so unstable that even the slightest bump in the road will make it explode spontaneously. The strength of their explosions is dependent on how much electricity they store in their bodies. Voltorb do not have a mouth, but do have two eyes that are normally slanted into an aggressive stare. In Pokémon Stadium, Voltorb featured in its own mini game, alongside Pikachu, called "Thundering Dynamo", in which players need to press the button corresponding to the lightbulb's color to charge up electricity.