Sony MDR-ZX770BT Help Manual page 50

Help Guide
How to Use
Wireless Stereo Headset
MDR-ZX770BT
Available operating time
The available operating time of the headset on fully-charged battery are as follows:
Music playback time: Max. 17 hours (SBC/AAC)/Max. 14 hours (aptX)
Communication time: Max. 17 hours
Standby time: Max. 450 hours
Note
Usage hours may be shorter depending on the Codec and the conditions of use.
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