Very Easy to use,just need place them outdoor in direct sunlight,Automatically turn ON/OFF, the light will turn ON when the dark,and the light will turn OFF when the daytime.Save money, for long life used; Each light includes an On/Off switch under the lid, turn it on before charging by solar.It need take 6-8 hours charging time by fine day , light up for about 8-12+hours.Environmental Protection and Energy Saving: 100% solar powered solar panel, requires no external wiring, so it's easy to get it all set up.Solar powered Mason Jar Lid Lights(Jars Not Included) , Suit for Any Regular Standard Mouth Mason Jars,Like all for Major : for Ball,Kerr,Golden Harvest, and Generic Mason Jars.Very popular Mason Jar String fairy firefly Lights,let your discarded mason jars become a beautiful lights,be good for decorations around your apartment. Hung over anywhere,just as patio,garden,bedroom,and also suitalbe for party,wedding,christmas,color warm white,easy make a warmly atmosphere for family.Diameter: 70mm/2.76 inchColor: as shownMaterial: Stainless steel, copperPackage Contents:18 * Mason jar lid string lights18 * Steel Wire Hangers3 * boxOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.