Chi Stylus gives you an entirely new way of interacting with your ASUS Transformer Book Chi. Palm rejection technology and 256-level pen pressure sensitivity give you an entirely natural and precise handwriting experience, you can even put your hand on the screen without any accidental input. Chi Stylus works on its own and doesn’t require a Bluetooth connection with your device, allowing you to instantly take notes or get creative with many of today’s popular apps including Lync, Outlook, and Skype. Chi Stylus has two programmable side buttons which can be configured for erase or right mouse click functions. It has a long-lasting 1mm tip for added durability, and works on a single AAAA battery for up to 9.6 weeks of regular use*. *Test conditions: 30mins of use and 30mins of standby, 5 days a week.