A simple click of a button and...You're ready to write... The Sheaffer Sentinel features a convenient push-button mechanism that allows you to activate the tip of the pen instantly. It's so easy that you can even do it with one hand behind your back. The Sentinel fits into virtually any Portfolio or pocket calendar, making it perfect for practical everyday use. Its classic slim profile allows for a pleasurable writing experience. Consider it an excellent gift for the student, professional... Or professional student.