Using the Memorial Boonboom Changer is easy. First, if you have other DX Boonboom Vehicles, just use them with the changer as it can read them. You can slot the changer on the Boonboom Handle, Change Axe, Shouka Blaster, DX Boonboom Robo, and DX Boonboom Killer Robo for different play experiences. When it comes to the Boonboom Trailer, although it doesn't transform, it adds a great show - accurate touch. As for the strap, since it's been made 130% bigger, it should fit you well if you're an adult. For maintenance, keep it in a dry place away from direct sunlight. Avoid dropping it to prevent any damage to the LEDs or other parts. Have fun with this awesome changer!