The Lenovo USI Pen 2 with Magnet is compatible with the USI (Universal Stylus Initiative) 2.0 standard and can be used with supported Chrome OS models. It supports 4096 levels of pressure sensitivity and tilt detection, enabling smooth writing. Color: Gray Dimensions (when packaged) (Length x Depth x Height) 220 mm x 55 mm x 20 mm Weight: 16.5 g Weight (when packaged): 64 g Power Supply: Power Consumption: AAA battery x 1 Other: Pressure Resolution: 4096 levels Operating System: Chrome OS