* Safety Waterproof Material: they are solar, are safe, environmentally friendly, No electrical. Made of PVC material, would be hard to break them. lights are waterproof high performance which works only with solar power, no other energy needed.This feature enables it to work continuously for 365 days and be suitable for outdoor use, creating a pleasant atmosphere for courtyard, lawn and tent. * Easy to Set Up and Energy Saving: Solar means simple installation and no power bills. charged well in the day time and ran for about 8-10 hours at night. No need to turn them off, they go off themselves when they are out of power or when the sensor detects light.