Overview

The ProtoArc EM11 NL is a vertical ergonomic mouse built around one idea: keeping the wrist in a more natural position during long desk sessions. Its body is angled 58 degrees from horizontal, so your hand rests closer to a handshake posture than to the flat, palm-down grip a conventional mouse demands. For people who feel stiffness after a full day of typing and clicking, that shape is the main reason to consider it.
Wireless flexibility is the second pillar. The EM11 NL pairs over Bluetooth or a 2.4GHz USB receiver and can hold up to three devices at once, with a button to hop between them. A 500mAh rechargeable battery tops up over Type-C, and the left and right clicks are tuned to be markedly quieter than a standard mouse. Cursor speed switches between 1000, 1600 and 2400 DPI from a button on the top shell, and thumb-side forward and back buttons speed up browsing and file work.

Connectivity & Compatibility

Two radios cover the connection side: Bluetooth and a 2.4GHz dongle. You can register two Bluetooth devices plus one receiver-linked device, then switch between them with a single press. That suits a desk with a desktop tower, a laptop and a tablet all in play.
Supported operating systems are Windows 8/10 and later, macOS X 10.12 and later, iOS 13 and later, and Android 4.3 and later. Any device with Bluetooth can use the mouse even when there is no free USB port for the receiver.
Two caveats are worth knowing before you buy. The forward and back buttons do not function on macOS, and only the left and right clicks are silent — the scroll wheel and thumb buttons are not. The unusual shell shape also means some right-angle USB cables will not fit the charging port, so the bundled Type-C cable is the safe choice.

Product Info

The EM11 NL sits in the affordable middle of the vertical mouse market. It bundles silent clicks, three-device switching, three-step DPI and a rechargeable battery at a price in the low thousands of yen, which makes it an easy entry point for anyone curious about vertical ergonomics without committing to a premium model.
Published dimensions are roughly 138 mm long, 68 mm wide and 0.28 pounds in weight. ProtoArc sizes the shell for medium to large hands with a palm length of about 17.5cm to 23cm, and notes that the unfamiliar shape can take one to two weeks to feel natural.

Best Use Cases

  • Office and coding work where wrist fatigue builds up over the day: the 58-degree tilt keeps the forearm in a relaxed line, though fast-paced gamers will want a conventional shape instead.
  • People juggling a work laptop, a home desktop and a tablet: three-device pairing and a switch button cut down on desk clutter, while single-device users will find the feature unnecessary.
  • Quiet shared spaces and late-night sessions: the muted left and right clicks keep noise low, but anyone expecting a fully silent wheel and side buttons will be disappointed.

Product Disclosure (Amazon)

  • Manufacturer: ProtoArc
  • Model: EM11 NL
  • ASIN: B0FNKZ6666
  • Note: This article covers a manufacturer-made product based on Amazon listing details.