The Venusian II is the next inline from the original Venusian, perfect for focus lighting, or entry level video. We have now added a push button on and off, with a battery level indicator built in to the button. So now you instantly now if your ready for the dive or need to swap batteries. The light comes as a complete kit with the YS mount, 2 x 18650 Lithium batteries (1 in light and 1 ready to go), charger, and a lanyard.