Each light emits multiple colors and automatically changes color within seconds. Battery: 3 x 1.5 V LR41 button cell powered, included and replaceable, lasts 2-70 hours each time, 2 hours for optimal brightness, reusable, economical and environmentally friendly. Size (each): about 0.47 x 1.38 inches (depth x length), made of silver-plated ABS, can be fully submerged in water without damage. Easy to use: remove the white tab and turn the LED on and off by rotating the base. Suitable for wall, window, bedroom, children''s room, living room, roof, garden, patio, deck, porch, hallway, corridor, pathway, balcony, pergola, terrace, gazebo, pavilion, fence, tent, shelf, farm, New Year, birthday, dinner party.