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The Iridium Extreme 9575 comes with two adapters, the charging adapter and the antenna adapter. This adapter allows your Extreme to connect to the charger, to an external antenna, or to a USB data cable. Connecting to an external antenna can allow you to use your Extreme from inside of a vehicle or building while still maintaining your antenna's line of sight to the sky. If you are not looking to connect to an external antenna you can use the charging adapter instead.