High Efficiency & Replaceable Battery - Each solar garden light has a built-in 600 mAh battery,when replacing it use only the type:600 mAh Ni-MH battery.These outdoor lights turns on automatically at night,the number of hours the lights stay on depends on the amount of sunlight received the day before.Up to a max of approx. 6-8hours. Waterproof & Protection Design - IP65 waterproof and high strength ABS make solar ground lights suitable for outdoor garden use.Recommend placing the solar light in a frost-free environment to reduce the possibility of damage. Easy to install & Mounting Position - Solar Disk Lights just need only 15~20 seconds to install the ground light on your desire location with spike.Position your outdoor lights in a location where it can be exposed to maximum sunlight during the day. Keep the Solar Panel Clean - Wiping solar powered lights regularly with a damp cloth.A dirty panel will reduce the amount of sunlight available to charge the units batteries.Disk Lights provide perfect lighting for your courtyard,gardens,sidewalks,lawns and corridors,etc. Customer Service - If you're unsatisfied with this item for any reason,please contact us we'll immediately help you solve the problem within 24 hours.Avoid your family from falling,Illuminate The Way Home.Decorative outdoor lights for your garden,pathway,yard,step,classy.