The 11SZ10-4000 from K&L Microwave is a Diplexer with Frequency f1 DC to 3.8 GHz, Frequency f2 4.2 to 8 GHz, Power 15 W, Frequency DC to 3.8 GHz / 4.2 to 8 GHz, Operating Temperature -55 to 85 Degree C. Tags: Module with Connectors, Suspended Substrate. More details for 11SZ10-4000 can be seen below.