Transparent member and liquid ejection apparatus

A liquid ejection apparatus comprising:

• a liquid ejection head capable of ejecting liquid onto a printing medium;
• a liquid tank capable of storing liquid to be supplied to the liquid ejection head and whose front wall is transparent;
• a transparent portion arranged at a position facing the front wall and through which one may visually recognize the remaining amount of liquid inside the liquid tank,
• wherein, on the transparent portion, in order to indicate whether one may inject all the liquid stored in a predetermined liquid bottle in an unused state into the liquid tank, an indicator is formed, which can be compared with a liquid surface of liquid stored in the liquid tank;
• a reception unit capable of receiving, from an external device, a display command of a graphical user interface for asking whether or not delivery of a transparent member with which the transparent portion can be exchanged is necessary;
• a display unit configured to display the graphical user interface in a case when the reception unit receives the display command;
• an obtaining unit capable of obtaining instructions input based on contents displayed on the display unit;
• and
• a transmission unit configured to transmit a delivery command for requesting delivery of the transparent member to an external device in a case when the obtaining unit obtains information indicating that delivery of the transparent member is necessary.