The PokéWalker has both the shape and colors of a regular Poké Ball. It has at least three buttons and a black and white interface. It will allow players of HeartGold and SoulSilver to transfer their Pokémon there. The Pokémon gain experience points and happiness as players walk, somewhat similar to the toys based on the Digivice of the Digimon series. It is currently unknown if this will be available outside of Japan.