Sony FE 100-400mm f/4.5-5.6 GM OSS Lens - Manual (Page 54)

Close the lid of the charging case.
By closing the lid once, the headset units are straightened and locked in place, even if they were not locked in
the charging case before.
2.
Hold the charging case in your hand and press the lid open button to open the lid. 3.
Press and hold the pairing button of the charging case for about 5 seconds.
The indicator (blue) on the charging case repeatedly flashes slowly twice in a row and the headset goes into
pairing mode.
You can remove the headset from the charging case after entering pairing mode. When you put the headset
units into both ears, you will hear a notification sound and the voice guidance say “Pairing”, from both headset
4.
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