Ergonomic Arm Rest Arm

Will this armrest attach to any type of desk? What works better, the mouse or armrest?

The Ergonomic Arm Rest Arm attaches to your desk via a clamp mechanism. The item can clamps to desks up to 6.7cm thick.
The Ergonomic Arm Rest Arm is designed to provide users with a forearm rest that moves with your arm as it moves to operate your computer mouse.
If you suffer from shoulder, neck and/or forearm fatigue and pain, then the Ergonomic Arm Rest Arm is a great solution to provide your workstation with additional armrest support.  

While Ergonomic mice help prevent and alleviate the pain of Carpal Tunnel Syndrome (CTS), tendinitis, and other repetitive strain injuries.
It fits your hand more naturally than a traditional computer mouse. This reduces pressure on your arm, wrist and hand while you work or play at the computer. It offers more comfort than standard mice as it supports all major parts of your palm and fingers.

You can have an ergonomic mouse and forearm support.

Hi, I was wondering of this is height adjustable?

Hi Jillian! The height of Ergonomic Arm Rest Arm is not adjustable. You may be interested with the Ergonomic Adjustable Forearm Support Delux, Ergonomic Arm Stand Set and Ergorest Arm Rest. They all have option to adjust the height to suit your needs.