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I believe the instructions state that the battery is only used when power goes out so you don't lose the time on the clock.
Sorry, there was a problem. Please try again later.Thank you for your inquiry! The Insignia™ Digital AM/FM Dual Alarm Clock with 4-Level Dimmer cannot run on batteries alone for full operation. It requires a plug-in power source to function normally, including displaying the time and using the radio or alarms. The batteries are only for backup, meaning they preserve your time and alarm settings during a power outage, but the display and main functions will not work on battery power alone. Keith | Insignia Support
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