The D5BT-2/4-5-N/N-GRI-LP from K&L Microwave is a Tunable Filter with Frequency 2 to 4 GHz, Bandwidth 100 MHz, Insertion Loss 2.8 dB, Supply Voltage 24 V. Tags: Benchtop, Digitally Controlled. More details for D5BT-2/4-5-N/N-GRI-LP can be seen below.