Pen reminder / Pen reminder

Daily life, is an indispensable part of the pen. Often encounter pen runs out of ink do not know.
If there is no ink in the office or on the road, the inconvenience of life. Set beneath the pen
assembly straw straw volume dial when he sports the color is triggered. Red is a clear indicator
of the need to add ink a straw. This product will be particularly useful, such as business or office.