Laptop docking station external interfaces lan rj45 usb 20 ps2 x2 audio out serial port parallel audio in video outputs dvi 1x displayport 1x vga usb 20 ports 4 compatible with hp elitebook 2170p hp elitebook 8440p hp elitebook 8440w hp elitebook 8460p hp elitebook 8460w hp elitebook 8470p hp elitebook 8470w hp elitebook 8540p hp elitebook 8540w hp elitebook 8560w hp elitebook 8760w hp probook 6440b hp probook 6450b hp probook 6460b hp probook 6470b hp pro