The PK-721S from Synergy Microwave Corporation is a Analog Phase Shifter with Frequency 10 to 20 MHz, Phase Shift 180 Degree, Insertion Loss 1.3 to 1.8 dB, Control Voltage 0 to 12 V, Operating Temperature -40 to 85 Degree C. Tags: Module with Connectors. More details for PK-721S can be seen below.