Humminbird 740157-1 PTC U2 portable suitcase set is made of high-quality and durable materials, which can last long in the marine environment. Includes a 9 amp-hour gel battery and wall charger, and is compatible with the following Humminbird models: HELIX 7 series, HELIX 5 series, 100 series, 300 series, 500 series, 600 series and 700 series. This product is specially designed for use in the marine environment.