Self-contained products shall be usable by people with visual disabilities without requiring an end-user to attach assistive technology to the product. If a product utilizes touch screens or contact-sensitive controls, an input method shall be provided that complies with Regulation .06D(1) and (2) of this chapter. If an ocular form of user identification or control is used, an alternative form of identification or activation which does not require the user to possess a particular ocular characteristic shall also be provided. If a product provides auditory output, the audio signal shall be provided at a standard signal level through an industry standard connector that allows for private listening using a headset or personal speakers. The product shall provide the ability to interrupt, pause, and restart the audio at any time. When products deliver voice output in a public area, incremental volume control shall be provided with output amplification up to a level of at least 65 decibels. Where the ambient noise level of the environment is above 45 decibels, a volume gain of at least 20 decibels above the ambient level shall be user selectable. A function shall be provided to automatically reset the volume to the default level after every use. Color-coding may not be used as the only means of conveying information, indicating an action, prompting a response, or distinguishing a visual element. If a product permits a user to adjust color and contrast settings, a range of color selections capable of producing a variety of contrast levels shall be provided. Products shall be designed to avoid causing the screen to flicker with a frequency greater than 2 hertz and lower than 55 hertz.