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info TOZO
Status LED indicators flash blue 1-4 times
Charging case battery status indicator (1 to 4 flashes depending on the charge level).
? What Causes This
Charging or discharging.
ⓘ What This Means
Keep charging the earbuds according to the number of blinks indicating the current charge state.
Source: page 7 of the official manual
From the manual
This error code appears in:
TOZO A1 True Wireless Stereo Earbuds