Does the stylus work on any phone or tablet?

It is a capacitive stylus, so it works on touchscreens that respond to a finger, including most phones and tablets. It will not work on screens that need an active pen, such as some iPad models with Apple Pencil support.

What color is the highlighter ink?

The highlighter in the cap matches the barrel color. The silver pen is the exception: it has yellow highlighter ink.

What kind of ink does the ballpoint use?

Black ballpoint ink, in a twist-action mechanism. The refill is a standard small ballpoint type, but no spare refills are included.

Can I refill the highlighter?

No. The highlighter is built into the cap and is not designed to be refilled, so once it dries out the cap's highlighter is spent.

Is it good for everyday office use?

It is fine for light writing, marking and screen tapping, and the metal clip keeps it handy. Heavy daily writers will wear through the generic ballpoint refill quickly.

Is it a good giveaway item?

Yes. It is a low-cost multi-function pen that looks more premium than a plain stick pen, which makes it a common choice for events and branded handouts.