Sony h.ear on 3 Mini Wireless Help Manual page 111

Help Guide
Wireless Stereo Headset
h.ear on 3 Mini Wireless (WH-H810)
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. If the smartphone is not connected with HFP, the remaining
battery charge will not be correctly displayed.
Related Topic
Checking the remaining battery charge
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