SY-MC4HBT-O is an HDBT twisted pair output card for the SY-MM matrix range, it has 4 x RJ45 outputs and is required to be paired with a SY-HDBT-70P-R receiver for each output.
SY-MC4HBT-I is an HDBT twisted pair input card for the SY-MM matrix range, it has 4x RJ45 inputs and is required to be paired with a SY-HDBT-70P-T transmitter for each input.