Sony XPERIA Manual page 23

Charging start sound sounds and Notification Lamp on handset lights up when charging starts.
When charging is complete, unplug AC Charger and remove USB Type-C connector of
AC Charger straight from handset
Charging ends.
Charging with Wireless Charger
Handset can be charged using a wireless charger.
For details on charging, see the instructions included with the wireless charger.
Products with a

Wireless Charging Cautions
Observe the following when charging with a wireless charger.
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comply with WPC (Wireless Power Consortium) wireless charging standards.