Mini-USB Port</br>Connects to standard Iridium wall (AC) and auto (DC) chargers</br>OEM Iridium Product</br>TNC Female Connector</br>Connects Iridium Extreme to external Iridium Antennas</br></br>Product Description</br></br>This charge base clips to the bottom of the Iridium Extreme 9575 satellite phone.  It is used to charge the phone via an AC or DC charger (not included) and to connect the phone to a computers USB port for data operations.  This version features an external antenna connection (TNC Female) to connect to a wide array of Iridium Antennas.</br><br/>http://www.amazon.com/gp/product/B00O990RNI