Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: How to program this kind of switch?
Document: This unit fits neatly into the space of a wall switch to program a light fixture. It has a backup for about 15 minutes during a power failure, let's you know when the bulb is out and doesn't turn the light on and off at the exact same time every day to ward off burglars when you're on vacation.
Purchased  two ,only one worked properly,did not want to go through hassle of uninstalling and shipping so , it's just used as an on/off switch instead of timer
easy to install, comes with very understandable directions.this is an updated model wall timer that replaces any light switch to provide multiple on and off choices.
The switch was actually working okay. The other comment was that the control knob was shipped installed on the control shaft and to install the device, I was instructed to remove the knob from the shaft. It came off so hard that I thought I had broken the switch. It's been working well since installation last month.
I have used these in the past and loved them. No chain home improvement store stocks this type (works with traditional small opening switch plate) any longer. I was bummed until I found them on Amazon. Now I don't have to change out every switch in the wall just to have an automatic timer on my outside lights!
I have had the Intermatic programmable timer before, at another home and wanted to install the same timer at this house to control the front and back porch lights. I like the Intermatic because if fits behind the same switch cover plate as a regular light switch. The porch light switches are both on double switches and I wanted to keep the same cover plates.The Intermatic programmable timer is easy to install, and the ones I have had work great.
I tried to find GE timer with no neutral required but could not so I settled for this. It's kind of cheap compared to GE but it does work if you can follow the confusing directions. So far I have light when I get home but we will see if it lasts.
The timers are extremely easy to program and install. I was very impressed with the timeframe in which my order arrived.
This is a replacement of a worn-out timer of the same make. With the aid of the instructions now I can program it. Without the instructions it was hopeless.
These timers work great, a little tricky to program but once it's programmed, it works wellI would recommend Intermatic timers
Answer: The instructions seemed fairly easy.  I bought bunches of these timers over the year.After the device is installedSlide Off/Clear/On switch to the left then to the right.  Red light should be flashing.Rotate dial clockwise until you get to the current time on the indicator dial and depress large round dial once.Rotate dial further clockwise until you get to your first planned ON time and then press the dial again. Rotate dial further until you get to your first OFF time and press the dial again. Continue to program ON and OFF times if more are desired.After pressing the dial for the last desired OFF time, continue to rotate the dial clockwise until the red light stays on.You are finished.You may override the current On/Off status anytime just by pressing the large round dial.Regards,Allen