The is a Poké Ball-shaped pedometer which can connect to "Pokémon HeartGold" and "SoulSilver" game cards via infrared signals. The player can transfer a Pokémon to the Pokéwalker from either "HeartGold" or "SoulSilver". Every time the player takes a step, the Pokémon inside gains experience points and the player earns "Watts", a type of in-game currency which was also used on the Pokémon Pikachu virtual pet. Players can also catch various Pokémon on the device and obtain items, then transfer them to the game. The device comes bundled with the games.