One Hand.
Full Control.
ERCHAM MK1 combines a gaming keypad and precision mouse into a single device, giving gamers, creators, and one-handed users complete PC control with one hand.
Designed for amputees, brachial plexus injuries, stroke survivors, RSI sufferers, and anyone who wants a more ergonomic way to work and play.
- Built-In Precision Mouse
- Fully Ambidextrous Design
- Modular Thumb Controls
- Patent-Pending Technology
What is ERCHAM?
First off, the name ERCHAM comes from Erchamion, "air KAH-m i-on" — an Elvish word meaning "one-handed." It felt right — a name rooted in resilience, with a modern, tech-forward edge.
ERCHAM MK1 is a revolutionary one-handed gaming and productivity controller that puts complete control at your fingertips — literally. Unlike anything else on the market, it features a fully integrated mouse, eliminating the need for a second input device.
Whether you're a gamer adapting to a new reality, someone born with a limb difference, or simply seeking the ultimate in ergonomic efficiency, ERCHAM was designed with you in mind.
True One-Handed Gaming
Full control without compromise. Access every button, joystick, and mouse function with a single hand.
Accessibility First
Built for gamers with limb differences, injuries, or conditions that affect hand mobility. Dignity through design.
Beyond Gaming
Seamlessly transition from intense gaming sessions to productive work. One device, endless possibilities.
Performance Driven
Low-latency response, precision controls, and ergonomic design for marathon sessions without fatigue.
Modular Thumb Cluster System
Designed to adapt to the user—not the other way around. The thumb module mounts on either side of ERCHAM for seamless left- or right-handed operation. One device. One SKU. Full flexibility.
Fully Ambidextrous by Design
Unlike traditional gaming keypads that lock users into a left-handed or right-handed layout, ERCHAM features removable modular thumb clusters designed specifically for each side of the device.
The left-hand thumb cluster and right-hand thumb cluster can be attached or removed independently, allowing users to configure ERCHAM for the hand they use.
Whether you're left-handed, right-handed, or need the flexibility to switch between configurations, ERCHAM adapts to you - not the other way around.
Why It Matters
- One device for either hand
- No separate left-hand and right-hand models
- Easier manufacturing and lower cost
- Better accessibility for amputees and mobility-limited users
- Future-proof modular design
The result is a truly ambidextrous gaming and productivity controller built around the user instead of forcing the user to adapt to the hardware.
Explore Every Angle
Get an intimate look at the ERCHAM MK1 from every perspective. See the precision engineering and thoughtful design that makes true one-handed control possible.
360 View - Full Rotation
Watch the complete rotation showcase
Underside Detail
Explore the precision engineering up close
Horizontal Profile
See the ERCHAM MK1 from every angle
See ERCHAM In Action
Explore our collection of product renders showcasing the ERCHAM MK1 in all its stunning color variants and angles.
Arctic White - Hero Angle
Arctic White - Front Keys
Arctic White - Side Profile
Arctic White - Front Strap
Arctic White - Front View
Arctic White - Side Detail
Arctic White - Top Down
Arctic White - Rear View
Digital Camo - Front Keys
Digital Camo - Hero Angle
Digital Camo - Side Profile
Digital Camo - Front Strap
Digital Camo - Front View
Digital Camo - Low Profile
Digital Camo - Top Down
Digital Camo - Rear View
Royal Purple - Front View
Royal Purple - Hero Angle
Royal Purple - Side Profile
Royal Purple - Front Strap
Royal Purple - Top Down
Royal Purple - Low Profile
Royal Purple - Rear View
Crimson Red - Hero Angle
Crimson Red - Front Keys
Crimson Red - Side Profile
Crimson Red - Front Strap
Crimson Red - Front View
Crimson Red - Low Profile
Crimson Red - Top Down
Crimson Red - Rear View
Interstellar - Hero Angle
Interstellar - Front Keys
Interstellar - Low Profile
Interstellar - Front Strap
Interstellar - Front Logo
Interstellar - Side Profile
Interstellar - Top Down
Interstellar - Rear View
Stealth - Hero Angle
Stealth - Top Down
Stealth - Front Keys
Stealth - Low Profile
Stealth - Front Strap
Stealth - Front Logo
Stealth - Side Profile
Stealth - Rear View
Why ERCHAM Stands Apart
We built what didn't exist. While other gaming peripherals offer half-solutions, ERCHAM delivers true one-handed independence with zero compromises.
"I set out to build a device that lets people with limb differences work and play with either hand. Ambidexterity matters to me — because if someone in my situation only had use of their other arm, most existing devices would be useless. The Razer Tartarus, for example, is left-hand only, has no mouse, and no way to stabilize your hand. And while the Azeron Cyro points in the right direction, it's expensive, limited to one specific hand, and many users struggle with quality and durability."
ERCHAM was designed to solve all of that — one device, either hand, real mouse control, and a strap-stabilized grip built for true one-handed use.
Built-In Mouse
No more reaching for a separate mouse. The integrated precision sensor gives you complete cursor control at your fingertips.
True One-Handed Control
Unlike keypads that still require a mouse, ERCHAM delivers complete independence. Everything you need, in one hand.
Ambidextrous Design
Whether you're left or right-handed, ERCHAM adapts to you. Truly universal design for everyone.
Strap-Stabilized Grip
A secure, comfortable hold that doesn't rely on grip strength. Game for hours without fatigue or slippage.
Accessibility at Core
Not an afterthought — accessibility is the foundation. Designed from day one for limb differences and mobility challenges.
Gaming + Productivity
From competitive gaming to daily workflow, ERCHAM transitions seamlessly. One device for your entire digital life.
From Loss to Legend
The moment everything changed.
In 2020, a motorcycle accident cost Joe Tomasulo his right arm. In an instant, gaming — something that had been part of his identity — felt like it belonged to a past life.
Recovery meant more than healing. It meant surviving on disability, living paycheck to paycheck, and rebuilding a sense of purpose from nothing.
Finding nothing on the market that didn't demand two hands, he took matters into his own. He glued a mouse sensor to a Razer Tartarus, strapped his arm to it, and reclaimed his control.
"Erchamion" — from Tolkien's Elvish, meaning "The One-Handed."Like Beren Erchamion who lost his hand to a wolf but achieved the impossible.
That first prototype wasn't elegant. It was duct tape, desperation, and defiance. But it worked. And for the first time since the accident, the future felt possible again.
What started as a desperate hack for survival has evolved into a mastercrafted device — proof that accessibility and performance don'thave to be separate worlds.
ERCHAM MK1 is here.
Empathy
Born from lived experience
Purpose
Built from necessity, not convenience
Resilience
Forged through adversity
From Concept to Reality
ERCHAM isn't vaporware. It's a proven concept with real prototypes and real results.We're currently building the official prototype and aiming to launch later this year if everything lines up.
I worked alongside friends and talented 3D artists to refine the model to where it is today, building and iterating across professional industry tools.
Development Roadmap
Concept & Research
Initial research into one-handed control ergonomics, user needs assessment, and competitive analysis.
Official Prototype
Building the official prototype with refined ergonomics, finalized button layouts, and integrated mouse functionality.
Testing & Refinement
Extensive testing with gamers, accessibility advocates, and people with limb differences. Iterating based on feedback.
Launch
Finalizing manufacturing partnerships and launching the ERCHAM MK1 to the world. Target: Later this year if everything lines up.
Our Partners
Manufacturing and prototyping specialists helping bring the official ERCHAM prototype to life.
Talented 3D artist who helped refine and perfect the ERCHAM model design.
Featured ERCHAM in a YouTube Short that racked up over 1.6 million views, spreading the word about one-handed gaming.
Developer and content creator behind Moddo, lending technical expertise and reach to help push ERCHAM forward.
City Editor at LOUtoday who covered ERCHAM in a feature article, bringing local news coverage to the project.
More partners joining as we head toward launch.
Want to partner up with us?
See It In Action
Watch Joe playing Halo using the ERCHAM MK1 prototype with one hand.
Join the Conversation
See the original post that started it all on r/disabledgamers and join the community discussion about adaptive gaming.
View Reddit PostMaking Waves Worldwide
From viral Reddit posts to international media coverage, ERCHAM is capturing attention and changing the conversation around accessible gaming.
Featured In
Disabled gamer prototypes true one-handed keyboard-and-mouse controller
After Losing His Arm in a Crash, He Built the Controller No One Made
Amputee builds one-handed gaming controller after losing right arm
Gamer who lost arm built one-handed controller
Lo de este jugador es digno de elogio: perdio su brazo en un accidente
MK1 Controller - One-Handed Gaming Innovation
ERCHAM: Gaming y productividad para una sola mano
Local news coverage of disability gaming innovation
Amputee Gamer Builds ERCHAM MK1: A One-Handed Keyboard-and-Mouse Controller
Viral post on r/pcmasterrace with millions of views
Louisville creator builds the ERCHAM one-handed controller
What People Are Saying
Quotes rotate automatically. Click any quote to view the source.
Join the Conversation
Over 3 million people have seen ERCHAM on Reddit. Join the community discussion and be part of the accessibility gaming revolution.
See the Viral Post on r/pcmasterraceBe Part of the Revolution
Join us on Kickstarter and help bring true one-handed gaming to life. Early backers get exclusive rewards, special pricing, and the satisfaction of making gaming more accessible for everyone.
Limited early bird slots available. Don't miss your chance.
Help Us Keep Building
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Support ERCHAM Development
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