snippet: Intelligent Controller/Amplifier 1 Required for 40 APTS. Requires NTR211 Power Supply. The Alpha Communications® / S.T.R.™ SP300-12K intelligent controller is used only with the HT3011W ReliaBUS™ series intercom and VH30-2D videointercom systems. The SP300-12K provides the intelligent 'BUS' circuitry needed to control the ReliaBUS™ system functions.

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