What a deal this is!  These spot lights will shine a little light on a tree or bush powered by the sun..  It's great looking out your window at night and be able to see some of your landscape lit up without being overpowering.  The lights last about 4-6 hours depending on how much sun they get in a day.  I have purchased about 20 sets of these and have spread them between two of my houses.  There are 3 to a box......and give them as gifts as well.