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What and why the PSA endless alert needed?
Your timer is 4 digits only. How does your timer show the current counting status from 9999 days (9999D) to 0 minute 1 second (00M00S) properly?
Do you have a clock, which is able to count down from any special event, such as Election Day, anniversary, wedding party, baby deliver day, birthday, or any others?
Does your day countdown clock is resettable for new event?
Do you have a timer, which can measure the lifetime of water filter?
Additional to aural alert, why people need visual alert?
Why count up feature is needed for a countdown timer?
Do you have clock module which delivers output signal when alarm time up?
Why you introduce 4 alarms clock for medical aid product?