Will the massage interfere with hand movements, such as typing or holding a pen?

The wrist mode is semi-open design, so typing and holding a cup are not affected at all; the arm strap is adjustable in tightness, allowing for elbow bending without any restraint; although the hand mode is fully enclosed, it supports touchscreen operation (replying to messages and changing songs are a breeze), making it super convenient to work while using it.