Advanced acceleration system: The Prometheus MXVIII-20k Nerf Rival blaster features an Advanced Acceleration System that fires up to 8 rounds per second* Rechargeable battery: This fully motorized Nerf Rival toy blaster comes with a rechargeable NiMh battery and a wall charger so there?s no need to stock up on batteries High-capacity hopper: This Nerf Rival Phantom Corps blaster has an easy-loading, high-capacity hopper that holds up to 200 Nerf Rival rounds Comes with 200 high-impact rounds: The Nerf Prometheus MXVIII-20K blaster comes with 200 Nerf Rival high-impact foam rounds Fires rounds at a velocity of 100 feet per second: Vanquish opponents as you blast rounds as a velocity of 100 feet per second (30 meters per second).For use with Nerf Rival products only Includes 1x 9.6volt NiMh rechargeable battery