Power supply:1 x CR 2032 battery(included) No flame,no melted wax,no smoke,environment frendly It can float on the water,automatic light when you put it in the water Specifications: Size:37 x 40 mm(D x H) Net weight:11 g Package weight: 19 g Color:White Packing Content: 1 lot(12pcs) x Candle Light