A voice control system receives a voice command from a user via a microphone. The detection portion extends away from the ink chamber relative to portions of the ink cartridge adjacent to the detection portion, at least when the ink cartridge is installed in an image forming apparatus; and at least one part of the detection portion is capable of obstructing at least a portion of a light beam directed through the detection portion. As the user moves the orientation of the viewing device, the tilt sensors detect the change in the device orientation.