How to use: First, insert the included keys into the appropriate slots on the Mobirates figures to hear the cool sounds. You can also swap different keys to experience various combinations. Note that the KingOhger Ranger Keys are sold separately. Maintenance tips: Keep the figures and keys away from water and extreme heat. Use a soft cloth to gently clean the surfaces if they get dirty. Have fun playing with your new Mobirates and Boonboom set!