Abstract: An electronic device is provided, the electronic device includes a primary device assembly and an extension assembly. The primary device assembly includes a first housing and a primary body circuit, the first housing has a first accommodation cavity, and the primary body circuit is disposed in the first accommodation cavity. The extension assembly includes a second housing and an extension circuit. The second housing has a second accommodation cavity, the extension circuit is disposed in the second accommodation cavity, and the extension circuit is signal-connected to the primary body circuit, to extend or enhance functionality of the primary device assembly.

Abstract: A junction box and an electronic device assembly system relate to the field of infrastructure technologies. The junction box includes an accommodation chamber (1) configured to accommodate a wire and a sealing cap (2) configured to seal the wire. An upper cover (11) of the accommodation chamber (1) is provided with a first through-hole (111) for wiring, a base (12) of the accommodation chamber (1) is provided with a second through-hole (121) for wiring, and a side wall (13) of the accommodation chamber (1) is provided with one or more operation windows (131). The upper cover (11) of the accommodation chamber (1) is provided with a first installation position for installing to a pole, and the base (12) of the accommodation chamber (1) is provided with a second installation position for installing to an electronic device.