The Pluto Valve, together with the Pluto Trigger, enables you to take photos of water drops colliding in mid-air (for splash photography)!
See the Valve Guide to help you get started with using the Pluto Valve.
The battery is not included in your package due to delivery issues. It is a standard 12V 23A battery. You can find one in most local stores, or on eBay or Amazon.