Sony WH-XB900N Help Manual page 19

Wireless noise canceling stereo headset

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Note

If you connect the headset to an iPhone, iPod touch, or Android smartphone with "Media audio" (A2DP) only in a multipoint

connection, the remaining battery charge will not be displayed correctly.

The remaining battery charge may not be properly displayed immediately after a software update or if the headset has not been

used for a long time. In this case, repeatedly charge and discharge the battery multiple times to properly display the remaining

battery charge.