This outdoor balcony lights charging by solar energy, have no extra utility electric cost, and no need to replace the battery. Lights automatically turn off during the day and turn on at night. it can work up to 8 hours after being fully charged. This solar patio lights is a great choice for Porch, Roof, Tree, Backyard, Deck, Barbecue, Umbrella, Fence, Pergola, Bistro, Restaurant, Hotel, Commercial building, Shopping Center, Dinner, Birthday, Christmas, New Year Party and more.