Do you have a question about the Sentry ATC-20 and is the answer not in the manual?
Details the clock's components and visual indicators on the LCD screen.
Explains how to select the correct time zone and the automatic DST function.
Describes the three levels of signal quality for radio-controlled time reception.
Provides initial steps for battery installation and automatic time synchronization.
Details the purpose and operation of each key on the clock.
Instructions for manually setting time, date, and 12/24 hour format.
Procedure for setting the desired alarm time.
How to activate, deactivate, and use the alarm and snooze features.
Guidance on when and how to replace the clock's battery.
Recommendations for achieving the best radio-controlled time signal reception.
Information regarding the product's warranty coverage and limitations.