The HP ProOne 400 AiO is available as a 21.5-inch touch version and a 19.5-inch non-touch version. It can be mounted to the wall, an arm, a cart or other accessories with standard VESA mount.
The HP ProOne 400 AiO is a connectivity hub, featuring a video- and audio-conferencing experience with an integrated Skype-ready webcam and microphone and DTS Sound+ audio software. The all-in-one PCs also include a DisplayPort for adding an external monitor and side USB 3.0 ports for additional accessory connections - including one fast-charging USB port, which is ideal for quickly charging tablets or smart phones. Users can also share their Internet connection with up to five devices using HP Wireless Hotspot.