The HP MPP 1.51 Stylus Pen 3V2X4AA in Gray is a digital ink pen designed specifically for use with HP Envy and Spectre x360 models. It features a rigid plastic construction and comes with an additional pen tip for convenience. With a sleek design and comfortable grip, this stylus pen is ideal for precise writing and drawing on your tablet or eBook reader. The pen is powered by an AAAA battery and includes a quick-start feature for easy setup and use. Enjoy a hassle-free writing experience with this high-quality HP stylus pen.