ZOWIE CELERITAS II features an optimal and more precise pretravel which is the distance the key has to travel before an action is performed. A high quality iron spring allows for each keystroke to be executed with a consistent increase in force throughout while also improving durability to meet the standard required in eSports. The CELERITAS II introduces the optical switch, which allows players to avoid double key presses. It also has illuminated keys, with brightness levels that can be adjusted or turned off completely.