note that Nest has already had to remotely patch the Nest Protect to disable the wave-to-silence feature, after they found that it would often accidentally trigger in the event of a fire, muting the smoke alarm. they’ve since edited all mention of that feature out of their web site because they couldn’t get it to work.

http://www.cpsc.gov/en/Recalls/2014/Nest-Labs-Recalls-to-Repair-Nest-Protect-Smoke-CO-Alarms/