These Diyas Switch on When You Put Water on Them (one spoon of water). Yes, Just Like Oil And Ghee Mitti Diya Thye are water Diyas. Flamless and Smokeles. The Diyas are Lighted From Led and Water That Makes Them Pollution-Free Without Having to worry about flame, No Fire Danger or burning risks, No Hot Lamp or oil to deal With. Easly Replaceable Batteries. Our Diyas Come With Button Cell Batteries That Could be easily replaced after the battery dies. Beautiful Decoration Night Lighting For Party, Valentine, Festival Celebration, Dinner, Thanksgiving, Christmas and Halloween Holiday Celebrations, Wedding Ceremonies, Special Occasions Such as Birthdays and anniversaries, Diy Projects and etc. Wind Proof For Both indoor outdoor use, at homes at homes restaurants, Churches , Schools, Backyards, Sports Venue and etc.