Wide Compatible: Compatable for Chromebook, including Chromebook C550-13, Duet Chromebook, 10e Chromebook, etc. 4096 Levels Pressure Sensitivity: This USI pen is great for drawing and writing and editing, provides an industry-leading 4096 levels of pressure sensitivity for natural writing and sketching. Long Battery Life: This USI pen for Chromebook can last for 150 days based on 2 hours active use daily. There is no button so this could avoid mistouching (Button function is disabled on current Chrome OS) What You Get: 1 x Pen for Chromebook. If you any question with your purchase, please feel free to contact us, we are here to help. USI Protocol: USI official certification, works with any Chromebook that supports the USI protocol. USI Stylus Pen for chromebook with 4096 Levels of Pressure Sensitivity for Lenovo Chromebook Duet,150 Days Battery Life(No Battery Included), AAAA Battery, Works with Chromebook(Grey)