Esterline’s interface products and services are delivered to customers through its network of business units, collectively known as the Interface Technologies Group. Although these units operate independently in various sectors of the input device industry, they are integrated and often work in parallel to provide OEMs with custom manufacturing solutions.

Esterline’s Traxsys Input Products business unit specializes in the design and manufacture of high-end track balls and computer input devices for OEM's man-machine interface solutions. Traxsys (previously Penny & Giles Computer Products) has gained a wealth of experience over the last thirty years in building solutions for challenging operating conditions in aerospace, medical and military environments. Traxsys has also pioneered a number of innovative and award-winning solutions for improved computer access for individuals with special needs.