DotPen - World's Best Active Stylus Pen for iPad, iPhone, and Most Android Tablets and Smartphones. Machined Aluminum Housing With 1.9mm Durable Tip. Works with most popular devices: DotPen is compatible with iPad, iPhone, and some Android tablets and smartphones. Works with most of the top apps: DotPen works works with most app, including popular apps such as ZoomNotes, Evernote, Paper by FiftyThree, ProCreate, and many more. 1.9mm Active-Quill : DotPen's unique Active-Quill writing tip is crafted from a durable thermoplastic, the Active-Quill tip has an extremely low coefficient of friction which glides effortlessly over glass displays. Built to last : DotPen is made of precision CNC machined anodized aluminum alloy with a durable soft-touch rubber writing grip. Up to 12 hours of continuous use on a single AAA battery (included). Note: For optimal performance, please ensure your device does NOT have a screen protector film applied. Not compatible with the newest iPad Pro and S-Pen devices.