Solar Charge&Long Working time:The Solar Ground Lights no need any electricity,When the solar panel is set under the sunny place, turning on the switch,the built-in solar panel will be automatically charged by sunlight in the daytime,each light has a large capacity rechargeable battery,can illuminate for 8-10 hours after fully charging.(Charging and working time will change depending on the weather)Light Sensor&Automatic turn on off :The Solar Disk light adopting the integrated light sensor to make it automatically turn on in darkness or at night, and turn off when in daytime or in bright area.High Level of Waterproof :The solar ground lights adopted IP65 grade waterproof design and stainless steel body makes it effectively isolate the water and mist with an external waterproof switch instead of pinhole switch. The in-ground light can work in any extreme weather normally.No worries about heavy rain, snow, frost, or sleet.Easy to install :No additional cables and wires are required,each solar ground lights have two spikes.Cross the spikes and fit it onto the light,choose a soft place to push the spike into ground, turning on the switch,make sure the place has sunshine,you can also put it on the deck or stairs without spikes