Genuine Microsoft Surface Pro 3/4 Stylus Pen 1710 3ZY-00010 Silver - for spares.

Sold as spares / repair / faulty The AAAA battery was recently changed and Bluetooth detects and pairs the pen and it displays 100% battery. The button on the top of the pen launches single click and double-actions (selected apps), however the writing function and the dot that usually shows when the pen is in close proximity don't work. Also the tip will need replacing. Maybe somebody who knows how to fix this, can...don't know.

eBay