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16-Channel RS-232 Relay Boards Code Name Image Price R165PROXR 16-Channel 5A SPDT RS-232 Relay Board with XR Expansion Port $259.00 R1610PROXR 16-Channel 10A SPDT RS-232 Relay Board with XR Expansion Port $299.00 R161DPDTPROXR 16-Channel 1A DPDT RS-232 Relay Board with XR Expansion Port $262.00 R163DPDTPROXR 16-Channel 3A DPDT RS-232 Relay Board with XR Expansion Port $302.00 R165DPDTPROXR 16-Channel 5A DPDT RS-232 Relay Board with XR Expansion Port $342.00