Dr. Queen 2.1x5.5mm Plug Batteries Case Holder Box with Cover & On/Off Switch for 8 x 1.5V AA Battery The Battery Case holder Fit for 8 x 1.5V AA Battery(batter Not Included) Connector Port Type : 2.1 x 5.5mm Plug Dimension : 12.6 x 7.1 x 1.9cm/4.9" x 2.8" x 0.75"( L * W * H ) Cable Length( Each ) : Longer than 20cm/0.8" ; Material : Plastic, Electric Part