B300 USB 3.0 DOCKING STATION FEATURE IDENTIFICATION
Alignment Pin
Interlock Pin 
Front Retainer
Push Button Lock
External Speakers
External Microphone or Headphones
(4) USB
3.0 Ports
Alternate DC In
WWAN Antenna
Connector
WLAN/GPS Antenna
Connector
Docking Connector
Alignment Pin
Docking Handle
Ethernet Port
Video Connection
(2)Serial Ports
DC Power
Connector
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