Install batteries and setup the time with time wheel There are 2 buttons beside time wheel One is Volume button which moves left to right and right to left Most Right High Volume Most Left Low Volume Another button to Setup the Clock Day Night mode Clock Music Time 7AM to 10PM Match the CUCKOO SOUNDS after the bird music by pressing button near the volume button with CLOCK TIME ONE BUTTON PRESS increases ONE SOUND For ex If time is 2pm Before 3pm at any time till 259 then the CUCKOO SOUNDS should be 2 after Clockss music There is lock for Pendulum DO NOT APPLY ANY FORCE Please GENTLY press and slightly move right to remove Pendulum Lock 4 AA Carbon Zinc Any Leak Proof Powerful batteries required for this Clock BATTERIES NOT INCLUDES IN THE SHIPMENT Note Time will slow down if any leakage batteries used