I purchased these because I got tired of plug-in candle lights.  They are so easy to set up with a suction cup that attaches to the window.  Unfortunately, I gave 3 stars because I thought I had plenty of sun coming in my windows to be able to keep them lighted at night.  I have a large window in The living room.  I put 2 candles in this window. One on the right will light up at variable brightness and the one on the left doesn’t light at all.  ( 
So just make sure that you will be locating these in windows that get a significant amount of sun daily in order for them to work These were perfect but unfortunately my sunshine is not!!