9 guidance statements support this object characteristic:
- Assistive technology-compatible - For systems with user interfaces, people may need content and operable elements to be accessed and presented through assistive technology.
- Multi-frequency events - For systems that present audio alerts and other events, people may need them presented in multiple frequencies, including frequencies where their hearing may be better.
- No tone differentiation - For systems that present audio alerts, notifications, and other events, people may need characteristics other than tone differentiation to distinguish between different audio events or obtain information from such audio events.
- Noticeable non-auditory alert - For systems that present auditory, time-sensitive alerts, people may need the alerts to be in a format that they will notice immediately, such as flashing lights or insistent vibration.
- Noticeable non-visual alert - For systems that present visual, time-sensitive alerts, people may need the alerts to be in a format that they will notice immediately, such an auditory alert or insistent vibration.
- Notifications in auditory alternatives - For systems that present auditory notifications, people may need visual or tactile equivalents.
- Output modality choice - As a user with limited or no vision or with limited or no hearing, I need to be able to choose modalities to be used for outputs from the system.
- Recognizable signals - For systems that provide alerts, people may need recognizable signals (including feedback and cues) for different alerts or other messages that use signals.
- Separate output control - For systems with assistive technology built into the platform or that work with assistive technology, people may need to be able to control output of assistive technology separate from output of content.