The FloraLyte Sub-9™ by AcoLyte® is like nine regular submersible FloraLytes in one compact, water proof unit. What's more, the LEDs in the Sub-9™ are twice as bright as the LEDs in regular FloraLytes. The Sub-9™ will run for 8 - 10 hours on 3 AA batteries which are included and replaceable. The Sub-9™ measures 2.5 inches in diameter by 1.25 inches high. Ideal for lighting vases and fountains. With it's flat bottom, the Sub-9™ is designed to rest comfortably on the bottom of a water filled vase or container without floating to the top.