I love the lights and they look great lining my flower beds. I bought several sets, however some of the lights stopped working not long after purchasing. The seller was prompt to replace which was greatly appreciated. I have since learned that the disk has a rechargeable battery that can be replaced. 12pk rechargeable battery was $11.00. The lights are much brighter than before. It came with 600mAh and I replaced with 1000mAh. This detail was not included in the pkg unless I missed it. I would not have bought more when the lights stopped working the 2nd time had I known I could replace the battery.