The CPL20L1P-4304-B7B7 from ETL Systems is a Proximity Coupler with Frequency 850 MHz to 2.15 GHz, Coupling 20 dB, Insertion Loss 1.5 to 2 dB, Average Power 5 W, Operating Temperature 0 to 45 Degree C. Tags: Module with Connectors, Proximity Coupler. More details for CPL20L1P-4304-B7B7 can be seen below.