the preferred embodiment of the control device 200 of the invention sides 212 are symmetrical and convex it is possible to create alternate embodiments having asymmetrical sides concave sides or other more complex curvilinear shapes the invention is not therefore considered limited to one of the specific shapes chosen for purposes of disclosure housing 202 has an upper region 204 and a actuation device 206 i e a trackball joystick touch pad or other device adapted to translate the movement of thumb 102 into an electrical signal representative of the movement of thumb 102 such activation devices are known to those of skill in the art and are not further described herein actuation device 206 is shown for purposes of disclosure as a track ball in fig2 and 3 but it will be recognized that other actuation devices either known or yet to be invented may readily be substituted therefore as the actual actuation device forms no part of the instant invention the invention is not considered limited to the particular activation devices chosen for purposes of disclosure but is seen to encompass any actuation device capable of translating either movement or position of a user 39 s thumb 102 to an electrical signal switches 208 a 208 b 208 c and disposed on a front region i e a region substantially diametrically opposed to the location of actuation device 206 of housing 202 and are adapted for.