Assistive Technology Loan Library item === This communication device has four buttons in a quadrant layout. This device has one level.. Overlays can be inserted into the device from the top. Boardmaker usually has this template available in the templates folder. This device does have a volume control. Easy recording. The jacks allow you to plug in one to four external switches to activate the corresponding buttons. This is useful if the student is unable to isolate activation of the buttons on the device. It can also allow you to use a number of button entries less than four (i.e. just connect one or two switches). www.enablingdevices.com.