ArmSupport Re:d (keyboard not included) makes a great productivity tool even better, helping to ensure proper work posture and alleviate muscle strain in your neck, back, arms and wrists while sitting or standing. Created specifically for RollerMouse Re:d and RollerMouse Re:d plus, ArmSupport Re:d aligns the upper body while you type and use your RollerMouse. Able to be clamped to the front edge of desks from 1" to 1-3/4" in thickness, this accessory to the RollerMouse Re:d is ideal for height-adjustable workstations.