as other reviewer have mention , this seem to be the only clock of its kind out there . it be the most sensible clock I have ever own . I have it set for a earlier time twice a week on the day that I run , and for a later time on weekend day . I do not hear a pop when the radio come on , so it be so slight I do not even notice it . the shortcoming be slight but I will mention they . to set the alarm you use the big knob on the top , and it make a fairly loud crank noise which can be kind of annoy to you sleep spouse . the other thing be that the little display that tell you if the alarm be on or not be very tiny - it would be nice if it be bigger . overall though this be a great alarm clock and I recommend it for anyone who do not get up at the same time every day .