A method for establishing a pairing between a hazard detector and an online account may include instantiating an application on a mobile computing device and receiving a first code from a central server. The application may receive a second code from printed material associated with the hazard detector. The hazard detector may broadcast a Wi-Fi access point, and the application may join the Wi-Fi access point. The application can be authenticated by the hazard detector using the second code, and the application can receive an identity of a home Wi-Fi network from a user. The application can then transmit the identity of the home Wi-Fi network to the hazard detector. The hazard detector can use the home Wi-Fi network to access the Internet and transmit the first code to the central server, where the central server can use the first code in completing the pairing process.