Aluminum cap off ballpoint pen has an LED light and a precision stylus that works with touch screen devices. The unique retractable precision stylus lets you see exactly where your mark is being made and is ideal for creative professionals. Rotate top clockwise to first locking position to extend stylus tip, rotate clockwise again to retract stylus tip. Retractable stylus Utility Patent no. 9684391. Three mercury-free AG3 / LR41 batteries included.