A nice Microlab FXR Bias Tee. Model HW-E50. Silver plated. This is new old stock. The bias TEE will block DC out the RF port and accept DC/RF in the other port. The BNC port will handle DC. The take off port allows one to use or monitor the DC voltage. While we don't have the exact specs on this model, the stated frequency range is 800 to 2200 MHz. In testing we found it passes signal nicely down to below 400 MHz. Loss at 400 MHz measured on our test sample .5dB, at 450 MHz .3 dB and from 800 MHz and up measured .1 dB. We think the power rating is 50 Watts average with 1KW peak and if the same as the other typical FXR TEEs of this HW series, the DC would be 1KV at 2A. You should check the power and DC specs of course by your own research. Has N connectors on the RF line, a BNC female for the DC port. Since we cannot account for the end user expertise, it is sold as-is as-found with no return or warranty.