The smoke detector has no telephone alarm to inform the installer whether it is responsible or not.

The installer is not responsible for the smoke sensor that has not been notified by the alarm. According to the relevant public information, there is no telephone alarm for the smoke detector, and the installer has no responsibility, but the responsibility belongs to the property, because the smoke detector belongs to public facilities, and the property has the obligation to maintain it. After the installer completes the installation, the property will not bear the final payment before the acceptance.