HP SPECTRE x2 review…What does set the HP Spectre x2 apart from the Surface Pro 4 is the connectivity options, as the addition of a 4G LTE wireless antenna and USB 3.0 Type-C ports that are capable of charging means this is truly designed for working on the go. As with other devices such as the Surface Pro (or the iPad Pro even), a stylus is a key part of the experience and HP has bundled its own HP Active Stylus.