How do I know if the battery level of the charging case is low?
When the earphones are placed in the case and the battery level is low, the white light on the case will flash for 4 seconds and then turn off. When the case is fully charged with earphones inside, the white light turns on for 4 seconds and then turns off.
From the official Zte True Wireless Stereo Bluetooth Earphones manual, page 1
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