Accessories The Talker can be equipped with a variety of accessories. A sampling of some of our accessories are listed below. External Speakers External speakers are a great addition for those who will be using a Talker in a noisy environment. Trackball A trackball makes input easier for those with limited motor skills. Click here to view a photograph of a trackball. Head Switch Head switches are used with our auto-scan feature. Users who cannot use their hands can a Talker equipped with auto-scan and a head switch to communicate. Mobile Power Adapter Allows the Talker to be powered from a wheelchair battery, automobile, or airplane power outlet. This greatly enhances the mobility of the user, allowing them to go indefinitely without having to recharge the Talker's battery.