Gomadic Portable AA Battery Pack designed for the Samsung SGH-A237 - Powered by 4 X AA Batteries to provide Emergency charge. Built using TipExchange Technology Specification: Input Voltage (4 X AA Batteries), Cable length (6 inches), Dimensions (5.0 X 1.5 X 0.75 inches), Circuit Design (Samsung SGH-A237 specific), TipExchange enabled (Yes) Integrated circuitry regulates output voltage specific to the Samsung SGH-A237. Advanced logic maximizes overall charger efficiency. Built using the unique Gomadic TipExchange Technology that protects your investment by providing the ability to upgrade charging ports by simply swapping physical connectors. The rugged composite design is built to last. This product is backed by our comprehensive Gomadic Lifetime Warranty. Safely engineered with reverse polarity protection, in the event batteries are accidentally put in incorrectly.