The 4212 from Inmet by Spectrum Control is a Power Divider with Frequency 3.7 to 4.2 GHz, Insertion Loss 0.4 dB, Isolation 20 dB, Input Power 2 W, Amplitude Balance 0.2 dB. Tags: Module with Connectors, Wilkinson Power Divider. More details for 4212 can be seen below.