A fire alarm comprising: a communication circuit configured to receive a signal by intermittent reception, communicate with another fire alarm according to a first communications protocol and to communicate with a management device according to a second communications protocol different from the first communications protocol, the first communications protocol using a first reception channel to receive a signal from said another fire alarm and the second communications protocol using a second reception channel different from the first reception channel, to receive a signal from the management device ; and a controller configured to activate the communication circuit in a cycle time of the intermittent reception, the communication circuit being further configured to, after being activated, measure a first strength of a signal on the first reception channel and, if the first strength is equal to or greater than a first threshold value, receive the signal on the first reception channel, else measure a second strength of a signal on the second reception channel and then, if the second strength is equal to or greater than a second threshold value, receive the signal on the second reception channel. a communication circuit configured to receive a signal by intermittent reception, communicate with another fire alarm according to a first communications protocol and to communicate with a management device according to a second communications protocol different from the first communications protocol, the first communications protocol using a first reception channel to receive a signal from said another fire alarm and the second communications protocol using a second reception channel different from the first reception channel, to receive a signal from the management device ; and receive a signal by intermittent reception, communicate with another fire alarm according to a first communications protocol and to communicate with a management device according to a second communications protocol different from the first communications protocol, the first communications protocol using a first reception channel to receive a signal from said another fire alarm and the second communications protocol using a second reception channel different from the first reception channel, to receive a signal from the management device ; and a controller configured to activate the communication circuit in a cycle time of the intermittent reception, the communication circuit being further configured to, after being activated, measure a first strength of a signal on the first reception channel and, if the first strength is equal to or greater than a first threshold value, receive the signal on the first reception channel, else measure a second strength of a signal on the second reception channel and then, if the second strength is equal to or greater than a second threshold value, receive the signal on the second reception channel. after being activated, measure a first strength of a signal on the first reception channel and, if the first strength is equal to or greater than a first threshold value, receive the signal on the first reception channel, else measure a second strength of a signal on the second reception channel and then, if the second strength is equal to or greater than a second threshold value, receive the signal on the second reception channel. <EOS>