d. How do you know (it is/they are) working?
Mark all that apply.
1[] Tested it/them
1[] It/they went off because of smoke
1[] It/they went off while cooking
1[] Changed the batteries
1[] The light is on
1[] Beeps when battery is low
1[] Other
e. Any other way?
[] Yes (Reask 8d and e)
[] No