Protect your DELTA Pro or its Extra Battery. Designed to fit with easy access to all ports, buttons, and access points. (Rugged protective material) Ideal to keep your DELTA Pro and Extra Batteries in great shape for years to come. (Waterproof and dustproof) Keep your portable power station safe from the elements. (Easy access) With a variety of access points, the cover allows you to operate your unit with ease. (Easy cleaning) Those same access points and velcro design make it easy to wipe down and clean the cover.