Instruct: Classify Amazon reviews into positive or negative sentiment
Query: 2 out of 3 do not work

I purchashed 3 of these timers ..... 2 of them do not shut off light... always on, except for a brief time when the finger is toggeling to the off mode, then light goes back on. Something not functioning right internally, so these are going back for replacement. Hope the new ones work. I have a couple of "old" ones been turning on the fish tank lights for 15 years reliably and are the same brand.