CYLAPEX CR2032 Battery Operated Fairy Lights 4.2 out of 5 stars 2,730 $9.99 source https://www.amazon.com/CYLAPEX-Battery-Operated-Christmas-Decoration/dp/B077N6Q3B8/ref=zg_bs_13679381_16/136-6618345-2859133?_encoding=UTF8&psc=1&refRID=HQ1H47R4348NN7CQWY29
