use an electric pump. i was trying to get this one too. but saw the reviews say that it's good for children around 2 but not older. mine is 3.5. wondering how old is your child, could you please update whether you are satisfied with it after a while? thanks.
i didn't buy it, it was there when i moved in, it's just a small red plastic bag cover. i believe you can find that near the fire alarm section at homedepot or lowes.