Lenovo's presence detection uses a radar sensor so that the laptop can automatically switch back on when you sit in front of it, and you can quickly pick up from where you left off. Those models also come with Lenovo's new human presence detection feature that's also available on the X1 Nano. Along with the refreshed T14s, the new X13 and X13 Yoga come with a fingerprint reader integrated right into power button for easy authentication, as well. That means their screens can show you more of what you're viewing, such as emails or tweets, at once. The company has redesigned the X13 and X13 Yoga, giving them a display with a 16:10 aspect ratio similar to the X1 Nano's. Lenovo has revealed the latest models - refreshed versions of previous laptops with new features that include a power button with built-in fingerprint reader - joining its ThinkPad line.