This is an MFJ model # MFJ-959B Receiver Antenna Tuner/Preamplifier for Ham Radio stations, which came from a local Amateur Radio operator's estate.  It requires a +12V DC power supply, and appropriate 50-ohm coaxial cables to go to/from your Radio, which are not included. A manual was not included, but is available for free on-line download, and I'm including a copy as shown in the last pictures.

The MFJ-989B is to be used for Receive only, and it provides the proper impedance matching to your receiver, so you can transfer maximum signals from your Antenna(s) to Receiver(s). It works over a frequency range of 1.8 to 30 MHz (160 through 10-Meter bands.) It has an internal 20 dB preamplifier, as well as a 20 dB attenuator to prevent Receiver overload. You can select between up to two different Antennas and two different Receivers.

The unit's dimensions are 9"W  X  6"D  X 2.5"H. There are both SO-239 and RCA rear-panel antenna jacks to go to your antenna(s) and receiver(s).

It appears to be in very good condition, but no testing was done. So because of "parts swappers" this unit is being sold "as-is" and no returns are accepted. I am not able to combine shipments since it's already boxed up and ready to ship out from a neighboring State.

Please see the manual that is available for free download if you have technical questions about the operation and use of this device, and the interconnect with your radio. I've taken a picture of the Introduction page of the manual, which you can see in the last picture, and zoom into for more information.

SHIPPING INFO:

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Shipping charges will be $13.65 via FedEx SmartPost Ground service to CONUS ONLY locations, with careful packing. Any International sales must use eBay's Global Shipping Program service, where I ship the unit to their forwarding facility in Kentucky, they take care of any necessary customs, etc. paperwork, and then ship onward to the winning bidder. The shipping charges are based on units of similar size and weight that I've recently shipped.

Please see my other listings for Amateur Radio and electronic test equipment. Thanks for looking!