The IIL clock chip has a clock, alarm with snooze and a countdown timer, for it's designed use as a part of a clock radio, where you can have the radio on or off, or use it as a wake up aid ( like I do) or to fall asleep using the radio, while it turns off so as not to awaken you during the night. Hidden feature is that you can get a display of the minutes digit ( not 10's of minutes) and the seconds count on the display, just by holding down a combination of the input selector buttons.
A lot of clock radios also use the redundant power switch on the small edge variable resistor volume control as a method to inject 100/120Hz or a 400Hz signal into the audio amplifier instead of the radio audio, with the open switch removing a short across a voltage divider, that is fed into the amplifier chip after the volume control at a fixed loud level.