The SK4-2734035540-KFKF-R1 from ERAVANT is a RF Switch with Frequency 26.5 to 40 GHz, Insertion Loss 5.5 dB, Isolation 40 dB, Power 20 to 23 dBm, Power 0.1 to 0.19 W. Tags: Module with Connectors, Solid State. More details for SK4-2734035540-KFKF-R1 can be seen below.