The SD-4-1 from Synergy Microwave Corporation is a Power Divider with Frequency 5 to 1000 MHz, Insertion Loss 0.9 to 1.9 dB, Isolation 15 to 30 dB, Input Power 1 W, Amplitude Balance ±0.4 to 0.9 dB. Tags: Surface Mount. More details for SD-4-1 can be seen below.