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Built for one hand. Designed for everyone.
One Hand - Full Control
Ercham MK1
ONE-HANDED GAMING & PRODUCTIVITY CONTROLLER
Built-in mouse - Fully programmable Ambidextrous
full customization across colors, themes, RGB, and control layouts.
360 view
Who This is For
ERCHAM MK1 is built for people who cannot use a traditional keyboard and mouse, including:
Amputees
Stroke survivors
Nerve and brachial plexus injuries
RSI and chronic pain users
One-handed gamers
These users need to move, aim, and press keys at the same time with one hand, something normal accessibility gear can’t do .
ERCHAM is also designed for people who want better performance and ergonomics, including:Power users and streamersMMO, MOBA, and FPS playersCreators, editors, and CAD usersPeople who spend long hours at a computer
Features:
True built-in mouse – A real optical sensor inside the device lets you aim, scroll, and move naturally while pressing keys.Full programmable keypad – 30+ total customizable keys for movement, abilities, macros, and shortcuts.One-handed control – Use mouse and keys at the same time with one hand — no mode switching or compromises.Stabilizing strap & palm rest – Locks your hand in place for comfort, accuracy, and long sessions.Fully ambidextrous – Works for left- or right-handed users with the same device.Dual Ambidextrous / Clickable Scroll WheelDesigned for real users – Built for amputees, nerve injuries, RSI, stroke survivors, and anyone who can’t use a traditional keyboard + mouse.Design to work with all. (PC, Mac, Linux, Playstation, Xbox)Fully Customizable shells, skins, colors, schemes!
Why ERCHAM is different
I guess, 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.
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.
| Feature | Ercham MK1 | Razer Tartarus | Azeron Cyro |
|---|---|---|---|
| Real mouse built in | ✅ Yes | ❌ No | ✅ Yes |
| One-handed control | ✅ Full | ⚠️ Partial | ⚠️ Partial |
| Ambidextrous (left & right) | ✅ Yes | ❌ Left-hand only | ❌ Separate models |
| Strap-stabilized grip | ✅ Yes | ❌ No | ⚠️ Partial |
| Designed for limb differences | ✅ Yes | ❌ No | ⚠️ Limited |
| Gaming + productivity | ✅ Yes | ⚠️ Gaming-only | ⚠️ Gaming-focused |
| Patent-pending system | ✅ Yes | ❌ No | ❌ No |
| Price Target | ~$199 | ~$80 | ~$300+ |
Founder Story
Hi - I’m Joe.In 2020, a motorcycle accident left me permanently without my right arm, and suddenly locked me out of gaming.Not because I couldn’t play.
But because nothing existed that combined aiming, movement, and actions into one affordable, high-performance device.For a long time, I stopped believing I could build anything at all.I gave up on my dreams. I was living paycheck to paycheck on disability, barely getting by. Before that, I was homeless.Life became about survival.And I didn’t want it to stay that way.So I Built OneI took a Razer Tartarus, glued a mouse to it, added a strap, and remapped everything.Aim. Move. Shoot. Interact.
All with one hand.And it worked.Not perfectly, but it gave me something back I thought I had lost.From Survival to PurposeThat prototype proved something bigger:This shouldn’t be this hard.So we took what the Tartarus got right, and finished it:- Fully ambidextrous
- Built-in mouse sensor for real precision
- Stabilizing strap system for control and comfortThat idea became ERCHAM.A one-handed system that combines keyboard and mouse into a single, high-performance device.Not a workaround.
What this should have been from the start.More Than a DeviceERCHAM is for:- Amputees
- Disabled gamers
- Veterans
- Anyone forced to adapt to tools not built for themBecause most technology still assumes you have two working hands.We’re here to change that.The MissionTo make one-handed computing and gaming not just possible
but powerful, competitive, and accessible.One Hand. Full Control.
Proof of Concept
Tartarus - mouse hybrid
![FRONT VIEW]()
FRONT VIEW
REAR VIEW
Phase I
Phase II
Phase III
Phase IV
POC Demo
Community Validation
Over 1.275 Million Organic Views Across Reddit#1 Post On r/razer — 100,000+ Total Views, 90+ Comments, 95% Upvote Ratio#1 Post Of All Time On r/disabledgamers — 50,000+ Total Views, 97.9% Upvote Ratio, 63 Shares, 97%+ Positive Feedback
“There is literally nothing like this on the market. I would buy this immediately.”— r/DisabledGamers user (anonymous)
“This would give me back my ability to play.”— amputee gamer (anonymous)
“Why hasn’t a big company made this already?”— one-handed PC gamer (anonymous)
(Real feedback from the disabled gaming community - shared anonymously)
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ERCHAM Adaptive Systems
LLC
Built by one-handed gamers. Patent Pending.