Alarm Clock is a free glass gadget that displays time in digits and lets you define an alarm as easily as you can imagine, offering both a selection of common timings and the option of a precise definition in whatever time.
The gadget is meant to provide a way of a quick alarm for the day, like when you need, for example, to remind yourself to watch this favorite show on the TV, etc.; you cannot use it to schedule alarms ahead of several days.
Note that the gadget won’t provide an option to change sound for the alarm, it uses the default Windows tada sound and a constant visual notification displayed in the gadget itself, which is both efficient, elegant and original!