The Quad DOCK Plus keeps you in the game, allowing you to charge up to 4 Wii Remotes and 4 “AA” rechargeable batteries simultaneously. LED charge indicators tell you when the charge status is full so you know when your Wii Remotes are fully charged. The Quad DOCK Plus includes 4 Rechargeable High Capacity Lithium-Ion Battery Packs for your Wii Remotes so you never have to worry about batteries! The custom LED illumination effects add style to your gaming set up. Stay in the game with dreamGEAR’s Quad DOCK Plus. The Quad Dock plus is powered by Lithium-Ion rechargeable battery packs which provide longer game play, longer recharge cycles, and overall better stability than NIMH rechargeable battery packs.