Powered by a solar panel with an integrated usb port for topping up in prolonged dark weather or for indoor use. When placing the solar panel in a south or south west position, it is unlikely you'd ever have to charge via usb, but it's good to have the option if we have an unusually run of dull days. Because of the usb option, they could be used indoors, but because it is a solar product it has an in built dusk till dawn sensor so the lights won't light unless it actually dark you can bypass this by facing the solar panel down. The lights come with a remote control to choose from various static colours, switch between colour changing mode, a selection of whites, brighten and dim, and to set a timer for 4, 6, or 8 hours on. You can still operate the lights without the remote, but not quite as much functionality. The lights have a memory function so will light up on the last chosen pattern. Add festoon lighting anywhere outdoors without the need for mains power50 colour changing led beads spaced 10cm apart along a 6.8m cablemains brightness from a portable productremote control includedusb chargeable usb c cable is not includeddesigned specifically to work in uk winterhigh grade frost resistant polycrystalline solar panelsturn on automatically at night and turn off automatically at dawnon off switch too so you can turn them off whenever you wantsimple to install with no wiring requiredrun time is up to 10 hours