Nest Labs is halting sales of its new Protect smoke detector after determining that one of its flagship features could accidentally delay its alarm from going off during a fire. The feature, Nest Wave, allows homeowners to wave at the Protect to turn off its alarm, should it sound when there isnt actually an issue. Nest has now found that this feature could be unintentionally activated. The best and safest thing to do is to immediately disable the Nest Wave feature.