You can check the approximate ink levels and the approximate service life of the maintenance box from the printer's control panel. Select Settings > Supply Status.
To select an item, use the 
buttons, and then press the OK button.
You can also check the approximate ink levels and the approximate service life of the maintenance box from the status monitor on the printer driver.
Windows
Click EPSON Status Monitor 3 on the Maintenance tab.
If EPSON Status Monitor 3 is disabled, click Extended Settings on the Maintenance tab, and then select Enable EPSON Status Monitor 3.
Mac OS
Apple menu > System Preferences > Printers & Scanners (or Print & Scan, Print & Fax) > Epson(XXXX) > Options & Supplies > Utility > Open Printer Utility > EPSON Status Monitor
You can continue printing while the ink low message is displayed. Replace the ink cartridges when required.