System for displaying hazard events and adjusting hazard detector settings on a mobile device includes a user interface executed on the mobile device, a hazard detector, and a computer server system communicatively coupled to the mobile device and hazard detector. The hazard detector generates hazard events indicating detection of smoke or carbon monoxide. The hazard events are transmitted to the computer server system and then to the mobile device. User interface displays the hazard events in an event group. User interface receives an adjusted value for a setting of the hazard detector and transmits the adjusted value to the computer server system. The computer server system determines that the adjusted value corresponds to the hazard detector, receives a check-in event from the hazard detector, and transmits the adjusted value to the hazard detector in response to receiving the check-in event. The hazard detector applies the adjusted value to the setting.