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.

Multi-Color Solar Powered Fairy Led Fence String Lights $1.48	New 16m 100 LED Garden White Solar Fairy String Lights $24.99	60 LED Solar Powered Party/Orament String Fairy Lights $1.48
60 LED Solar Powered Mix Colour String Lights Lighting $1.48	60 LED Solar Powered Party/Orament String Fairy Lights $1.48	MultiColors 12M Solar Powered Garden String Lights $1.48