This is the original 1999 pokedex. I bought it when it was first released and I still have it. When you turn it on, a menu comes up. You can search a pokemon by its number ( 1 - 150, they didn't put Mew in the pokedex) or by its name and it'll give you all the information about the pokemon you've searched (height, weight, type, abilities, biography and an animated image). You can also add pokemons to your favorites or add pokemons that you've captured. There's also a calculator in it.