The DBTC-9-4+ from Mini Circuits is a Directional Coupler with Frequency 5 MHz to 1 GHz, Coupling 8.85 to 8.93 dB, Directivity 13.44 to 21.7 dB, Power 0.5 to 1 W, Average Power 0.5 to 1 W. Tags: Surface Mount. More details for DBTC-9-4+ can be seen below.