This smoke alarm is the opposite:
- Battery lasts until one should replace the detector anyway
- The LED blinks when the battery runs out, what to instructions should be the case in about 10 years
- When testing the alarm goes first going slowly gets louder.
- The test button is huge, you can take easy with a broomstick or lying about toys and test.
All in all: The thing hanging from the ceiling and not annoying. So mote it.