For indoor or outdoor use, this is a strand of multi-colored cat lights.  There are 10 lights spaced 12" apart, with a 30" lead wire.  Comes with 4 spare bulbs and 2 replacment fuses. Each plastic kitty light cover measures about 3" long.  Suitable for Christmas tree. patio, or other year round decor. Connect up to 3 sets. Uses 12 volt bulbs (like small holiday light bulbs)