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ProtoArc XK04 Foldable Compact Keyboard for Phone and Tablet, Black | Pocket-Sized, PU Leather Cover, Bluetooth 3-Device Workflow, for Business Travelers, On-the-go Typing
ProtoArc

ProtoArc XK04 Foldable Compact Keyboard for Phone and Tablet

Bottom line: The ProtoArc XK04 Foldable Compact Keyboard for Phone and Tablet ($24.79 on Amazon as of 2026-10-07): Folds to pocket size at just 7.8 oz for true everyday carry; main trade-off: 0.55-inch keycaps are smaller than a full-size board, so touch typing takes adjustment.

$24.79

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Buy on Amazon — $24.79 Compare to similar gaming peripherals

By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For keyboards, mice, headsets and other PC peripherals, synthesises manufacturer specs and independent reviews rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

*Price sourced from Amazon.com. Last updated 2026-10-07. Price and availability subject to change.

Pros & Cons

Pros

  • ✓ Folds to pocket size at just 7.8 oz for true everyday carry
  • ✓ Bluetooth 5.1 pairs 3 devices with dedicated switch keys, no re-pairing
  • ✓ Auto-sleep standby rated up to 150 days between charges
  • ✓ Built-in PU leather cover protects the keys without a separate case
  • ✓ 10.76 x 4.07 in unfolded fits airplane trays and cramped cafe tables

Cons

  • ✗ 0.55-inch keycaps are smaller than a full-size board, so touch typing takes adjustment
  • ✗ Compact layout trims keys a full keyboard would include
  • ✗ Two-fold hinge adds a seam down the middle of the typing surface
  • ✗ Must power on before pairing or the device will not appear

Manufacturer description

The ProtoArc XK04 folds a full typing surface into something that slips into a jacket pocket. At 7.8 ounces and 10.76 x 4.07 inches unfolded, this foldable Bluetooth keyboard is built for people who write on phones and tablets instead of laptops. The two-fold hinge closes into a PU leather cover that doubles as scratch protection, so you can drop it in a bag or briefcase without a separate sleeve. Bluetooth 5.1 gives you a 33-foot range and pairs three devices at once. Dedicated switch keys move you between your iPhone, iPad, and Android tablet without re-pairing or swapping cables, which…

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SpecPicks Verdict

SpecPicks scored ProtoArc XK04 Foldable Compact Keyboard for Phone and Tablet using a rating × review-volume × price-fit model applied to published specs and reviews across the gaming peripherals category. ProtoArc's gaming peripherals lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for gaming peripherals of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

How many devices can the ProtoArc XK04 connect to at once?

Up to three. Bluetooth 5.1 holds all three connections simultaneously and dedicated keys switch between them, so you never re-pair when moving from phone to tablet.

Does it work with both iPhone and Android?

Yes. The layout is optimized for mobile devices and supports iPhone, iPad, and Android tablets over Bluetooth 5.1 with a 33-foot range.

How small is it when folded, and how much does it weigh?

It weighs 7.8 oz and measures 10.76 x 4.07 inches unfolded, folding in two into a pocket-sized form with the PU leather cover closed around it.

How is it charged and how long does the battery last?

It recharges over the included USB-C cable. Auto-sleep standby is rated up to 150 days, so it stays ready between trips. Check the product listing for active-use runtime.

Is it worth the price compared with typing on a touchscreen?

If you draft messages, notes, or email on a phone or tablet away from a desk, the physical keys and 0.55-inch keycaps are the trade for a bit of pocket space.

Key Features

  • Pocket-Sized Everyday Carry Design: Ultra-compact two-fold bluetooth keyboard at just 7.8 oz folds into a small form with premium PU leather cover, making it the lightweight travel companion for typing anywhere
  • Specifically for Phones and Tablets: Compact keyboard layout optimized for mobile devices provides physical typing capability for iPhone, iPad, and Android tablets with 10.76 x 4.07 inch unfolded size, ideal for on-the-go messaging and notes
  • Bluetooth 5.1 with 33ft Range: Connect to up to 3 devices simultaneously. Switch with dedicated keys – no re-pairing, no cable juggling.(Note: Turn on power before pairing)
  • PU Leather Protection: Integrated PU leather protective cover shields the keyboard from scratches while adding a premium look, letting you carry it confidently in bags or briefcases without additional cases
  • USB-C Rechargeable: Recharge with the included USB-C cable and rely on auto-sleep standby up to 150 days, so the travel keyboard is ready when your work moves
  • Space-Saving for Tight Workspaces: Compact layout with 0.55-inch keycaps fits comfortably on airplane trays, cafe tables, and limited desk spaces, letting you create a workspace even where desk room is minimal

Full Specifications

BrandProtoArc
ColorBlack
StyleContemporary
Weight7.8 oz
MaterialAcrylonitrile Butadiene Styrene, PU Leather
Model NameXK04
Style NameContemporary
Unit Count1.0 Count
Switch TypeClicky
ConnectivityBluetooth, USB-C
Model NumberXK04
Power SourceBattery Powered
CompatibilitySwitch, Android, iOS
Built-In MediaFoldable Wireless Keyboard, Phone Stand, USB Cable, User Manual
Number of Keys65
Button Quantity104
Keyboard LayoutQWERTY
Mfr Part NumberXK04
Special FeatureFoldable, Lightweight, Portable, Rechargeable, Silent
Antenna LocationBusiness Travel, Mobile Typing, Phone Messaging, Tablet Note-Taking
Full listing titleProtoArc XK04 Foldable Compact Keyboard for Phone and Tablet, Black | Pocket-Sized, PU Leather Cover, Bluetooth 3-Device Workflow, for Business Travelers, On-the-go Typing

Ready to buy?

ProtoArc XK04 Foldable Compact Keyboard for Phone and Tablet, Black | Pocket-Sized, PU Leather Cover, Bluetooth 3-Device Workflow, for Business Travelers, On-the-go Typing is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

Buy on Amazon — $24.79

*Price sourced from Amazon.com. Last updated 2026-10-07. Price and availability subject to change.

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ProtoArc XK04 Foldable Compact Keyboard for Phone and Tablet, Black | Pocket-Sized, PU Leather Cover, Bluetooth 3-Device Workflow, for Business Travelers, On-the-go Typing
$24.79
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