One Hand.
Full Control.
The first true one-handed controller with a built-in mouse. Designed for accessibility. Built for performance. Made for gamers and creators who refuse to be limited.
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.
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 - Black Edition
See the ERCHAM MK1 from every angle
360 View - Detailed
Explore the precision engineering up close
360 View - Full Rotation
Watch the complete rotation showcase
See ERCHAM In Action
Explore our collection of product renders showcasing the ERCHAM MK1 in all its stunning color variants and angles.
RGB Signature Edition
RGB Top View
RGB Underglow
Stealth Black - Top
Stealth Black - Angle
Arctic White - Top
Arctic White - Angle
Arctic White - Bottom
Interstellar - Angle
Interstellar - Top
Digital Camo - Top
Digital Camo - Angle
Classic Camo - Bottom
Crimson Edition
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.
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.
Evolution Gallery
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
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
Every contribution helps fund continued development, testing, and manufacturing.Can't back on Kickstarter but still want to support the mission? Your donation makes a real difference.
Support ERCHAM Development
100% of donations go directly toward product development and accessibility innovation.
Donate via GoFundMeDonations are processed securely through GoFundMe. Thank you for believing in our mission.