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 used; Each light includes an On/Off switch under the lid, turn it on before charging by solar.It need -8 hours charging time by fine day , light up for about 8-12+hours. and Energy Saving: 100% solar powered solar panel, requires no external wiring, so it's easy to all set up. Solar powered Jar Lid Lights(Jars Not Included) , Suit for Any Regular Standard Mouth Jars,Like all for Major : for Ball,Kerr,, and Generic Jars. Very popular Jar String fairy firefly Lights,let your discarded jars become a beautiful lights,be good for decorations around your apartment. Hung over anywhere,just as patio,garden,bedroom,and also suitalbe for ,wedding,christmas,color warm white,easy make a warmly atmosphere for family. Diameter: 70mm/2.76 inch Color: as shown Material: Stainless steel, copper Package Contents: 6 * jar lid string lights 6 * Steel Wire Hangers 1 * box Only the above package content, other products are not included. Note: Light reflection 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.