Tablet Stylus, Easy Operation Stylus For GT-156HD V2/GT-220 V2 For GT-221 PRO For GT-191 - Walmart.com
Kamvas GT-156HD V2 I don't think the pen is supposed to open at all but the charger stopped going in and after investigating the port it looks like something broke inside. The
Huion Kamvas GT-156HD V2 Drawing Tablet Monitor 15.6in for sale online | eBay