Solar Powered Christmas Lights with 30 LED Bulbs by BOS. $24.95. Uses AA rechargeable batteries (included). 30 flashing, red, green and blue LED lights. Measures roughly 18 feet long, approximate 4" light spacing. Solar unit has ground stake. 30 multi-color LED solar string light set. Use it for wrapping around a tree, umbrellas, outdoor Christmas decorating and more. Great for using where there is no electricity or where you don't want to hassle with an extension cord.