Kidde i90 uk c smoke alarms with hush test kidde i9080 uk c this smoke alarm from kidde uses an ionisation sensor to detect fast flaming fires and can be used anywhere around the home however it is ideal for hallways bedrooms and landings equipped with numerous features including a hush button to temporarily silence nuisance alarms eg cooking or steam it has a loud alarm with a flashing light indicating the alarm is operating and that a test button is available for checking the alarm