The 11SZ10-2000 from K&L Microwave is a Diplexer with Frequency f1 DC to 1.9 GHz, Frequency f2 2.1 to 4 GHz, Power 15 W, Frequency DC to 1.9 GHz / 2.1 to 4 GHz, Operating Temperature -55 to 85 Degree C. Tags: Module with Connectors, Suspended Substrate. More details for 11SZ10-2000 can be seen below.