I had probably this same exact model. It has a light on the control so you'll know it's working. I preferred to have a lamp with smaller bulbs than the usual 250 watt, but this heat pad does what the $100 or so brooder plate does for much less. I used about 12/18 inch section of 2/4 fence wire to make a "cage" to put the heat pad on top of, lower in back and higher at the opening.Let me throw this idea by you. It is also much less ca$h. You make it yourself, and the heating pad is around $16. The one you want is without the automatic timeout.
Here is a link to Blooie's thread writeup. Learn all you need to know there.
https://www.backyardchickens.com/th...d-in-the-brooder-picture-heavy-update.956958/
I evaluated in my thinking,,, and the one you are considering with the feathers, I would pass on. I think the feathers make for a dark interior, and if a chick is overheated towards the rear, would have to push her way towards the narrow entrance. JMO
Here is the heating pad that would work for the home made brooder.
Ad is from Walmart
View attachment 3754292