Wireless sirens

 

— wireless connection is usually carried out over a radio channel using Wi-Fi, Bluetooth or specialized standards (communication protocols - see the corresponding paragraph). The absence of wires significantly simplifies the installation of sirens, especially in hard-to-reach places. Moreover, the range of such communication can reach tens or even hundreds of meters. In theory, a radio link is more susceptible to interference than a wired connection; However, in practice, it is not easy to jam such communications, and quite advanced encryption systems are usually provided to protect against signal interception. But the clear disadvantages of wireless models are their higher cost than wired ones, and the need to organize their own power supply (in the form of batteries/batteries or a separate connection to the network).