Sony WH-XB900N Help Manual page 109

Wireless noise canceling stereo headset

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Help Guide

Wireless Noise Canceling Stereo Headset

WH-XB900N

The remaining battery charge of the headset is not displayed on the screen of

smartphone.

Only the iOS devices (including iPhone/iPod touch) which support HFP (Hands-free Profile), and Android

smartphone (OS 8.1 or later) can display the remaining battery charge.

Check that the smartphone is connected with HFP (Hands-free Profile). Otherwise, the remaining battery charge will

not be correctly displayed.