This Ben 10 Basic Tech Gear - Proto-Tech Booster is a special Plasma Grenade and storage pod given to all Plumbers as part of their military arsenal. The Proto-Tech Booster has a special time release wind up and explode feature. The Proto-Tech Booster easily attaches onto item (mfr item# 32415 - The Ben 10 Deluxe Proto-Tool Tech Gear) for the Ultimate Proto-Tool Mode.