A:AnswerHi Denise.
I understand that you left us this question because you are interested in this product. There is no mention of an alarm feature on the documentation available for the device. It doesn't seem to have one.
Charles V. - Insignia Support
https://www.insigniaproducts.com/contact-us
A:AnswerThe USB port can only be used to power something like your phone and is not an input. The antenna works great in my experience but clear stations come down to where you live.