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.

60LED 7M Solar Powered Wedding Party String Lights $9.95	Solar 100 LED String Decoration Lights For Party Garden $20.46	11M SOLAR POWER GREEN CABLE PARTY STRING LIGHT Blue $9.99
Blue 60 LED String Solar Fairy Lights Wedding Xmas $0.99	60 LED 36FT Solar Garden Party Fairy String Light Blue $1.56	New 36.1 FT 11M Solar Powered 60 LED Outdoor String X'mas Lights Lamps $15.78