The Nerf Barrel Break Sonic Blaster is a double-barrel blaster lets you fire one dart at a time or unleash both barrels at once! The removable ammo rail holds 8 darts and comes with 10 whistler darts, ammo rail and instructions. The Nerf Barrel Break Sonic Blaster requires 3 AAA batteries (not included). With simple beginnings forty years ago as an orange foam ball, NERF is not only now a key player in action based performance toys but also transcends the toy aisle as a lifestyle brand for kids and adults alike. Whether its working with some of the most notable athletes of the day, sponsoring the Dew Tour with the NERF DART TAG World Championships or bringing a no-holds barred blaster experience to the video game environment, Hasbro, Inc's NERF brand continues to redefine both the sports and toy world.