The clock radio gains or loses time.
The clock radio may gain or lose time after a certain period of operation. This can be due to power interruptions and the status of the backup battery installed in the unit. For example, if a power interruption occurs and the clock radio operates on a backup battery, time may be gained or lost depending on the strength of the battery.
Use of a power adapter may not correct this even if using the correct voltage as the clock may rely on the frequency of the power source being used, such as a power transformer.