The Gelblaster Surge fires from an included 800 round hopper powered by an internal Lithium rechargeable battery (with USB charging cable included), and can be switched on the fly from fully-automatic blasting to semi-automatic blasting! The new GelBlaster Surge now also offers adjustable velocity thanks to interchangeable barrels, allowing newer or younger players to dial the blasting back to approximately 100 feet per second, while more experienced Gelblaster players can blast at up to 175 feet per second for more intense fun! Non-staining, affordable, environmentally friendly and upgradable, the Gel Blaster Surge is safe, simple, affordable and FUN for everyone, with safety glasses and Gellets included!