Perfect, simple, effective and economical (no batteries required)

I had never used this kind of decision. Received quickly but I did not record but I finally understood
Already you must turn on the device you have connected here. Leave the side switch on clock (for programming). Indicate the current time by turning the large buttons (direction of the arrow) then lower the small gray clips around the big button to specify start and end of operation.
Example 14H is now and I want my lamp lights 20H 21H a: Turn the knob until the white arrow that faces the 14 then lower the small clips from 20 to 21.
It works on my LED lamp and no batteries required! At the top. I advise