First of all, the Magnet Switch is the little screw and magnet that came with the strobe. It fits in the hole on the right side of the back of the strobe.
Basically, it is used to tell the strobe whether to ignore pre-flashes or not.
If your camera flash outputs a pre-flash, the magnetic switch should be REMOVED. If your camera flash does not output a pre-flash, the magnetic switch should be INSTALLED.
Pre-flash – Magnet Switch Removed.
No Pre-flash – Magnet Switch Installed.
Oh and don’t worry, no water will come through the hole even if it’s open. It’s completely sealed!
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