Battery-free Pen - Only applicable to Huion Kamvas PRO 12, Kamvas PRO 13,Kamvas Pro 16, Kamvas 16 and Kamvas 20 Graphics Drawing Monitor; Will NOT work with any other models;Never worry about pen-charging, and eco-friendly of use; Without operating battery, the pen is only 14g in weight. | 8192 Levels of Pen Pressure Sensitivity - Enjoy the accuracy and precision when drawing; Having 266 PPS report rate, 5080LPI resolution, you can paint or draw or sketch smoothly as you like. | Two Customizable Pen Buttons - Set the function to your reference like eraser, fasten your working efficiency; Palm rejection design of dual keys on both sides of the pen helps reduce touch frequency and realize most effective creation. | Long-lasting lifespan - First of Huion's products features battery-free stylus, say goodbye to charging cables; Don't need to worry about the potential battery leakage and run-out. | Note: The battery-free pen PW507 is suitable for Kamvas GT-191 V2(700K). But please check the fourth and fifth S/N numbers on the back of the GT-191 V2(700K) to make sure which pen you should buy for replacement. If the number is D0, please buy the PW500. If It is E2, please get the PW507.