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This microwave manages to be one of the most effective user interfaces I've ever come across. Pressing the plus ("+") button ups the time in 10 second increments, until you reach 90 seconds, and then it ups the time in 1 minute intervals. Once you pass 90 seconds, the display shows whole minutes. You can't set a time of 17 seconds, for example, or even 6 minutes and 30 seconds.