Before now the only way to get the LEDs needed for such kits as the MG Qan[T] and 00 Raiser was to go through the parts department in Bandai Japan. This set is for the green LED used in light compatible kits. Each unit takes 2 LR41 watch batteries (sold separately). Set of 2 green LEDs that can be used on a number of Gundam products including MG Sazabi Ver Ka, MG Gundam Exia, MG Marasai and more! LR41/AG3 batteries not included.