Sony FE 100-400mm f/4.5-5.6 GM OSS Lens - Manual (Page 120)

If the headset units and charging case are charged while they are wet with sweat, etc., the charging ports will
corrode. Before charging, wipe off any moisture with a soft dry cloth and leave to dry in room temperature.
Repairs in case of a malfunction without care are not covered by the free warranty.
When the charging ports of the headset or charging case get dirty, wipe them clean with a soft dry cloth.
Do not wash pants or shirts with the headset units left in the pockets.
If the headset is cracked or deformed, refrain from using the headset near water, or contact your nearest Sony
dealer.
Turn the microphone hole downward and gently tap it about 10 times on a dry cloth, etc. to remove any water
collected inside. 3.
Leave the headset to dry in room temperature. 4.
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