Hold down the SET button while firmly pressing in the TIMER button.   (The TIMER button has a child tamper and water resistant cover. You may need to press with your fingernail to feel the click of the mechanical button under it.)2. Release both buttons when “PLAY” appears.  (“PLAY” will flash for 5 seconds.)3. While flashing, press only the TIMER button again to select the mode:  PLAY | 30 | 60 | 90 | OFFThat's it! When the flashing stops, your mode is set.   To change modes, repeat steps 1 through 3.In PLAY mode you can play the song and lights simply by pushing the TIMER button. In the 30, 60 and 90 minute count down modes, the song and lights play ONLY at the end of the timer cycle.  Off mode stops the timer.PLAY – TIMER button activates song and lights.  (Manually play without waiting for a timer.)30:00 – 30 minute timer cycle   (Music and lights play at the end of each timer cycle.)60:00 – 60 minute timer cycle90:00 – 90 minute timer cycleOFF – Off