Surface Pro Pen, 4096 Levels of Pressure Surface Stylus Pen for Surface Pro 3 Pro 4 with Eraser Function and 4 Tips- Black 1.The pen only works with surface pro 3 and surface pro 4 Windows INK with MPP protocol. 2. 4096 Levels of pressure for high-fidelity writing: Pen responds to the pressure of your hand precisely.Sketch, write, and erase naturally with no perceptible lag between the Pen tip and your line  just like you would on a sheet of paper. 3. Erase and right-click button built in pen, please keeping press the Erase button when you need use it. 4. The pen comes with 2 types of Tips, Soft and Hard. Soft tip suit for no screen without protector, Hard tip suit for screen with protector, They can be removed and replaced by using the included Tip Replacement Tool. 5.We have : ONE-YEAR SOLID WARRANTY: Once you buy our product, you can get our 1 year warranty. For any defective product or product you arent satisfied with, you can freely contact us for the full refund.