Systems and methods for integrated network devices utilizing low-power technologies are disclosed. In some embodiments, a method may include receiving, over one or more pairs of low-voltage wires (e.g., telephone wires, intercom wires, security system wiring, etc.), an electrical current sufficient to power an electronic device disposed within a controlled-environment facility (e.g., a jail, prison, etc.). The method may also include performing an electronic operation within the facility and transmitting, to a communication system serving the facility over the low-voltage wire(s), information related to the operation. In some implementations, the electronic device may be a mobile phone detection apparatus, a wireless access point, and/or a surveillance device. The method may also include, during a first time interval, using the electrical current to store a charge in a battery, and, during a second time interval, using the current in addition to the charge stored in the battery to perform the operation.