These are rope lights, or string lights that are solar powered. The come in different colors and are ‘wireless’ meaning you do not need to plus these in!

Just place in your yard or anywhere there is sunlight and they will charge during the day.
Makes for great party settings, and they are free to power, so you dont have to worry about paying for the electric.

7M 60 LED Garden Outdoor Solar String Fairy Light Blue $0.76	White 100 LED Solar String Fairy Light Christmas Party $10.39	Multi Color Solar 60 LED Fairy String Outdoor Lights 7M $1.53
13m 60 White LED Solar Powered Outdoor String Lights $0.67	Solar Power 60 led String Lights 11M Blue Lamp Outdoor $1.53	Solar Powered White 11m LED Garden Fairy String Lights $1.53