Sony DWR-R03D Operating Instructions Manual page 33

(estimated remaining time of transmitter operation)
when metadata for settings is received by the unit. To
display the cumulative usage time of the unit, set to
other than TIME.
• When TIME and PERCENT are selected, the
cumulative usage time cannot be reset using the
wireless remote control function.
• The displayed value is a guide, and may not be accurate
depending on the usage conditions and environment.
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