These are great Dell docks. WD 19, some WD TBS, one K20A, one 22TB4. The pictures have the exact models and are labeled 1-8, so please specify the exact one you want if it matters. They are all basically the same dock, some have audio out. 130 Watt power supplies included.The Dell Dock WD 19 is a versatile docking station compatible with various Dell laptop models, such as the Inspiron and Latitude series. Featuring Thunderbolt 3 ports, USB 3.0 and 2.0 ports, HDMI, and Ethernet connectivity, this dock provides a range of options for expanding your laptop's capabilities. Its sleek black design and rigid plastic construction make it a reliable accessory for enhancing your workstation. With passive cooling technology and built-in USB ports, the Dell Dock WD 19 is a practical and efficient solution for expanding your laptop's connectivity options.