Pen S has the same refill adapting capability of the ANTOU pen series, and it is designed for more well rounded daily carry scenarios. The sleek design provides a comfy grip in hand, and also fits in well in any compacted bags or stationery holders. Flip it upside down and switch from a writing pen to a stylus tip for any smartphones or tablets, assisting one on managing the daily task with ease while browsing on a tablet and scripting down ideas.