A:AnswerYou'll need to select Cook Time on the control panel and then input the seconds that you would like to set for your cooking time. Also, by pressing the Add 30 Sec pad will add 30 seconds to the time counting down each time the pad is pressed. -Don@GEAppliances
A:AnswerIn all installations we recommend using the mounting bracket and hardware that will be packaged with the new microwave. We have compared the style of bracket used for your existing model and the one included with the new model. They are completely different.-Vikki@GEAppliances
A:AnswerIn the event of a power failure, the clock will need to be reset. Press Set Clock, enter the time and press Start. This model doesn't offer a date function. -Vikki@GEAppliances
A:AnswerWe can confirm that this model would make a great replacement for your prior Spacemaker model. They both have similar dimensions and features and are designed to fit into a 30" wide cabinet opening. For more information on the mounting space required, check out the Specification Sheet, which can be viewed at the bottom of the Features tab on the product page of the Best Buy website. Lauren@GEAppliances
A:AnswerThe JVM3160DFWW model is a comparable replacement model. We do recommend using the mounting bracket and hardware that will be packaged with the new microwave. -Vikki@GEAppliances
A:AnswerIm sure it could be used as a countertop item. I dont recall the instructions having and specific issues. Its just designed and built with the bracketing pre installed. And then the individual installation location can dictate exhaust ventilation distribution. Being its designed for Over stove it pulls steam and vapors up theough unit and then blows them out where desired.