My headset used to click on and off, now it doesn't. What gives?

When Leitner/Sennheiser/Marathon headsets are in phone mode and the EHS settings are disabled (for Marathons this means Lifter Mode) the charging base makes a click sound when the headset turns on.

When you move to EHS modes, PC mode, or No Lifter mode, the base no longer clicks when the headset is turned on.

The More You Know, Right?