An ink cartridge includes a support member, and a rotatable member connected to the support member. The rotatable member includes a pivot portion formed at a point of connection between the support member and the rotatable member, and a signal blocking portion. The signal blocking portion is disposed within an inner space of a translucent portion. The rotatable member also includes a float portion disposed within an ink chamber. The float portion is positioned between the signal blocking portion and the pivot portion, and the float portion is configured to move between a first position and a second position based at least on an amount of ink disposed within the ink chamber. Specifically, as the ink within the ink chamber is dispensed from the interior of the ink chamber to the exterior of the ink chamber a surface of the ink within the ink chamber moves in a first predetermined direction, and when the float portion moves from the first position to the second position each of the float portion and the signal blocking portion moves about the pivot in a second predetermined direction which is slanted with respect to the first predetermined direction.