Upgraded 2-in-1 Plug-in & Solar Powered Flag Lights Solar energy supply, remote control, no extra utility electric cost. Light sensor controls the solar string lights charging at daytime and AUTO ON at dark. 420 LED beads with a lifespan of 100000 hours. Cerflyer US flag lights come with an additional UL-listed safety 24V low voltages adapter, switch power sources at any time for your convenience.