What headphone jack is on Garrett ACE series?

What headphone jack is on Garrett ACE series?

The jack is 1/4" on most of the Ace series detectors. The exception is the new Garrett Ace Apex. The Garrett Ace Apex has a 1/8" jack. It also has the built in Z-Lynk technology so wireless Z-Lynk MS-3 headphones are compatible.