Using the switch role

The ARIA switch role is very similar to the checkbox role, however it has different semantics — it has two states that represent on/off, rather than checked/unchecked states.

From the ARIA 1.1 spec: The aria-checked attribute of a switch indicates whether the input is on (true) or off (false). The mixed value is not supported, and user agents MUST treat a mixed value as equivalent to false for this role.