A signal-emitting retail display device that includes a wire having a top portion and a bottom portion, the top portion configured to support a label holder, the bottom portion configured to store one or more retail items. The signal-emitting retail display device also has an electronic unit that includes an emitter. The emitter is configured to emit a warning signal, and configured to transmit a wireless signal to an alarm box in response to the warning signal. The wire is electrically coupled to the electronic unit such that the wire functions as an antenna for the transmission of the wireless signal to the alarm box.