Tombow Reporter 4-Colour Pen

Smart 4-colour pen with a matt black rubber grip and translucent barrel in a choice of black, blue, pink or clear.
Large spring-loaded clip that opens extra-wide enhances practicality.
Pen contains Black, Blue, Red and Green fine-point ballpoint refills. Each colour is operated by a colour-coded selector at the top of the pen, and each selector is additionally coded by shape, presumably so you can operate it in the dark. How you see to write in the dark is a problem the pen doesn't solve!

BR-CS2 refills available here