Experience head-to-head competition with the precision and power of the Nerf Rival blasters! Use this rechargeable battery pack with Nerf Rival Khaos MXVI-4000 blaster (sold separately) instead of batteries to increase the blaster's rate of fire. With this rechargeable pack, there's no need to stock up on batteries - just recharge and get back into battle! Includes wall charger. Includes rechargeable NiMh battery, charger, and instructions. Rechargeable battery Comes with wall charger Increases rate of fire Ages 14 and up. For use with Nerf Rival products only. Not compatible with Nerf Rival Zeus MXV-1200 blaster.