Smoke detector highly rated in various reliability test. The Hush off function automatically resets after 10 minutes, useful in case of momentary smoke production. But in practice it takes a stepladder or a broomstick, so not very convenient. The stack is given for 1 year, but the difference in cost with the top model 29HLD-EN lithium battery (duration> 5 years) is exactly that of a lithium battery on Amazon. I preferred to buy this lithium battery to the unit to better control its date validated (production + storage + eventual use). The presence of a smoke detector is required in homes at the latest March 8, 2015, to be placed preferably in traffic access to the rooms.
