Spec Sheet Preview: The Alpha Communications® / TekTone model PK250B Uninterruptable Power Supply is primarily used with the NC300 / NC300II series and/or HC345C series microprocessor based nurse/emergency call systems and provides for uninterrupted power in the event of utility power failures, voltage surges, spikes, brownouts and blackouts. It's economical cost and extremely compact size will enhance the operation of all your NC300, NC300II and HC345C systems. When power is interrupted, the PK250B immediately cuts in to provide square wave pow …