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This design is to avoid peoples small mistake when using the knob of the alarm clock. Normally the alarm-setting knob and the time-setting knob are installed at back, which are almost same, with quite similar round shape and size. Then there comes the problem. Usually people will doze off before falling asleep and most of them directly set the waking-time without having a glance at the back of the clock. As a result, they realize they rotated the wrong knob when they saw the hour/minute pointer spinning from the front side. However, this design gives the alarm-time-setting knob a bell icon shape, an absolutely different shape and tangible feeling from the time-setting knob. Touch different and prevent such mistake from happening.