When use it? Use more than 240 light beads please use the power cord. (If you are 60leds/M that is more than 13.2ft, If you are 30leds/M that is more than 26.4ft)
Still rating 5 stars so it stays up, but i have tried for weeks to get more than one string of lights chained together, and the company does not appear to sell a way to plug them in. Avoid these if you have another option