ProtoArc XK01 Keyboard + Microsoft Arc Mouse: The Frequent Traveler's Input Combo

The Pitch: Full-Size Portability

ProtoArc's XK01 promises something rare: a full 104-key keyboard with numpad that folds to roughly half its width. Pair it with Microsoft's Arc Mouse, which curves for ergonomics and flattens for travel, and you theoretically have a complete mobile workstation that fits in any laptop bag. After three weeks of daily use across airport lounges, hotel desks, and coffee shops, this combo delivers on portability but demands adaptation on the typing front.

Design and Build Quality

The XK01's party trick is its center hinge. Unfold it and you get a standard full-size layout measuring 12.6 inches wide. Fold it and it becomes a 6.3-inch brick that slips into a backpack side pocket. The aluminum top plate feels premium, though the plastic underside and battery compartment show the $45 price point. Scissor-switch keys have 1.5mm travel, shallow but crisp.

The hinge is the design's strength and weakness. It creates a physical gap between the T-G-B keys and Y-H-N keys, roughly 3mm wide. Your brain adapts after a few days, but fast typists will initially feel the interruption. The hinge also introduces slight flex if you type aggressively on one half while the other rests on a soft surface.

Microsoft's Arc Mouse remains one of the most distinctive pointing devices you can buy. The snap-curve design goes from flat (for storage) to arched (for use) with a satisfying click. The touch-sensitive scroll strip replaces a traditional wheel, giving you infinite scrolling with haptic feedback. Build quality is excellent, all soft-touch plastic and hidden seams. At 2.9 ounces it practically disappears in a bag.

Typing and Input Experience

Typing on the XK01 feels closest to a modern laptop keyboard. Key spacing is standard, actuation is light, and there is zero key wobble. The numpad is full-size, not cramped, which matters if you work with spreadsheets. Three Bluetooth profiles let you switch between laptop, tablet, and phone with a quick Fn+1/2/3 combo. Switching is instant and reliable across Windows, macOS, and Android devices tested.

The center hinge interrupts typing flow more than ProtoArc admits. If you touch-type and your hands drift toward center, you will occasionally clip the gap. After two weeks I stopped noticing during prose writing, but fast coding with lots of brackets and special characters kept triggering awareness of the split. If you are a hunt-and-peck typist or work primarily with the numpad, you likely will not care.

The Arc Mouse's scroll strip is polarizing. Swipe up or down and you get smooth, responsive scrolling with subtle vibration feedback. It works beautifully for long documents and web pages. Precision tasks like scrubbing video timelines or adjusting sliders feel less natural than a notched wheel. The two main buttons are quiet and responsive. Missing: side buttons or gesture controls found on premium mice like Logitech's MX series.

Battery and Connectivity

The XK01 claims 40 hours on a charge via micro-USB. Real-world testing with moderate daily use (3-4 hours typing) gave me about a week between charges. That is acceptable but not impressive. Logitech's K380 runs for two years on disposable AAAs. The micro-USB port feels dated in 2026, especially when the mouse uses AAA batteries that last roughly three months with daily use.

Bluetooth pairing is straightforward on both devices. The keyboard connects via standard Bluetooth 5.0, the mouse via Bluetooth 4.0. Neither supports USB dongles, so older PCs without Bluetooth are out of luck. Connection stability was flawless across devices tested. The keyboard auto-sleeps after 10 minutes of inactivity and wakes instantly when you tap any key.

Who This Combo Is For

This pairing makes sense for a specific user: someone who travels frequently, needs a numpad for work (accountants, data analysts, engineers), and values packability over absolute typing perfection. The XK01 is the only foldable keyboard with a full numpad at this price point. The Arc Mouse complements it by being equally compact and distinctive.

If you do not need a numpad, Logitech's K380 offers better key feel and legendary battery life in a smaller footprint. Pair it with an MX Anywhere 3 and you get a more refined experience for $35 more. If typing quality matters most, Keychron's K7 low-profile mechanical keyboard destroys the XK01 on feel but does not fold and costs $30 more.

The Verdict

The ProtoArc XK01 and Microsoft Arc Mouse solve a real problem for mobile professionals who refuse to give up the numpad or ergonomic mouse comfort. The keyboard's hinge is a meaningful tradeoff, not a dealbreaker, and the combined $95 price point beats most premium alternatives. Just know you are prioritizing portability and multi-device flexibility over ultimate typing refinement. If those priorities align with yours, this is the combo to buy.