The SAL-2 Series (SAL-2WS-16R-2) is a 16" Black Wireless Clock incorporate multi-function software as well as a microprocessor based movement. Every clock receives the signal and retransmits it to the surrounding clocks, this means that the clocks not only can get the time from the main transmitter, but also the surrounding clocks. The SAL-2 Series (SAL-2WS-16R-2) wireless clock transmit a stream of data every two hours (standard) or four hours (economy) on the battery operated (2 D cells) model, and every minute on the 24V, 115V and 230V (international only) models. These clocks include automatic calibration and enhanced diagnostic functionalities that allow the user to view how long since the last time the clock received a signal, the quality of the signal, and a comprehensive analysis of the clock itself and remaining battery life.