I bought FIVE, three tier candles & all of them do not come on by the sensor light on the far left candle on each unit. You have to turn the switch off, then on again & then that candle on the far left will come on! I have one at my place & bought four for my parents as part of their Christmas gifts. And at their house, the candles do the very same thing! ONLY TWO of the three candles come on by sensor light...all THREE candles DO turn off at dawn, the far left, middle & far right. Very diappointing...my parents have to turn them on manually to get all three cadles burning & I the same at my place...I was trying to make LESS work for them! There must be a defect in these candles in the sensor light...please check into this. :-(