The PK-711S from Synergy Microwave Corporation is a Analog Phase Shifter with Frequency 4.75 to 5.25 MHz, Phase Shift 180 Degree, Insertion Loss 1.2 to 2 dB, Control Voltage 0 to 30 V, Power -10 dBm. Tags: Module with Connectors. More details for PK-711S can be seen below.