There are three alarm times (A1, A2 and A3) that you can set. If you press the S button once or twice, the first alarm clock A1 appears. If it says "onA1", it is switched on, if it says "ofA1", it is switched off. Use the ^ button to switch back and forth between onA1 and ofA1. Press the S button to switch from A1 to A2 and A3. All three alarm times must be set to of, then it should no longer ring.