Using your Pets Alive Hamstermania hamster is easy! First, get 2x AAA batteries (not included) and put them in the hamster. Turn it on, and watch it start running in and out of its ball and making those cute hamster sounds. As it moves around, it will sense walls and doors all by itself. For kids aged 3 and up, it's a great toy to have fun with. When you're done playing, turn off the hamster and remove the batteries if you won't use it for a long time. This helps keep the batteries from leaking and damaging the toy. To clean the hamster, use a dry cloth to gently wipe it. Don't submerge it in water as it can damage the electronics inside. Remember, the styles are assorted and selected randomly at dispatch. If you have a favorite style, add a note to your order, and we'll do our best to get it for you, but it depends on availability. Each hamster is sold separately, so if you want to collect all 4, you'll need to buy them one by one. You can also visit your local Toyworld store to pick the one you like directly.