Using the DX Build Driver is super easy. First, take the two included DX Full Bottles, which are the Rabbit and Tank ones, and insert them into the driver. Once they're in, give the lever a turn. You'll immediately be greeted with cool lights and fun sounds that make playtime really exciting. If you want to see an even more awesome effect, turn the lever again, and you'll activate the finisher. As for the promo Build Gashat, we can't guarantee it because it depends on what our suppliers have in stock. But if there are any available, we'll send them out with your order on a first - come, first - served basis. When it comes to paying, if you choose to pay the full amount, you won't have to worry about any extra shipping costs in the USA. To keep your DX Build Driver in great shape, avoid dropping it or exposing it to water. Also, keep it away from small children who might put the small parts, like the bottles, in their mouths.