The Arc Mouse comes with a felt pouch that fits the folded-up Arc just right.

One might be forgiven for mistaking the Arc for something else other than a mouse when it is folded up.

The Arc’s hinge mechanism is smooth and spring loaded, snapping into place when the mouse is folded or unfolded.

This design is quite effective in reducing the size of the mouse for storage, as the comparison photo below shows.

While the Arc’s shape is hand-neutral, the predominance of right-handed persons no doubt led Microsoft to place the side button on the left.

A small LED is concealed in the line running up from the scroll wheel is used to indicate battery level. If it briefly glows green when the mouse is unfolded then there is sufficient charge, but once the battery runs low it is supposed to be a constantly lit orange (we’ve yet to encounter that).

Turning the Arc over reveals the USB transceiver neatly tucked away in a small receptacle. Just in case you were wondering, it is held in place magnetically.

A pity that the transceiver is not small enough to plug-and-forget, – it sticks out enough that you’ll want to take it out before putting your laptop away to avoid any transceiver disintegration accidents.

Due to space constraints we also see the tracking sensor being moved to the front of the mouse.

The Arc requires two AAA-sized batteries.