I have a couple, and they work, but occasionally, the tabs pop up and it skips time (most notably when you try to use it for 15min on 15 min off, or anytime you have only 15mins of runtime set for each cycle you are controlling, and have only one tab pushed down. I'll include a pic of the timer. It is not the one I have, but the way you set the time on it and the little pushtabs are identical.
Well I fixed that issue of the tabs popping up.
Once you get it set, tie a piece of string around it, or use a rubberband to keep the on and off tabs locked into their up or down position. I hope this makes sense to everyone. anyone having this issue with the tabs popping up, will know exactly what I am talking about. So I hope this helps them. Peace:smoke: