Dell Premium Active Pen PN579X Model number listed in the second photo. Functionality confirmed. This pen was included with an XPS I used. It is a used item, so there may be scratches and stains. Please purchase only if you understand that it is a used item. It will be wrapped in bubble wrap for shipping. Please be sure to check the official website for compatible devices. The following is quoted from the official website: The Dell Premium Active Pen offers flexible and multi-protocol compatibility with select Dell 2-in-1s with Windows Ink compatible displays. The pen's multi-mode controller works with all protocol platforms of MPP 1.51 (Microsoft Pen Protocol), Wacom AES 1.0, and the latest Wacom AES 2.0 technology.