Spec Sheet Preview: The Alpha®/S.T.R.™ R2006 and R2007 Series Alphatone™ units are designed to work with our HT2006, HT2000 and HT3000 series handsets, respectively. The R2006 units work only with the HT2006 series handsets, and are used when there is one (1) or more door entry stations that need to send an audible tone signal to any of the inside HT2006 handset stations. Typically the R2006 units are used in intercom or video-intercom systems, using the NH208TVU intercom/door station power supply/amplifier. …