This is a Shure wireless receiver with a rack mount kit and dual antennas. Model # ULXP4. This is in good, used, but not abused, condition. The main mode knob is missing (just fell off, it did not break) the unit is still fully operational and I understand the knob is available from Shure parts. The power supply cable had a little nick in it and it has been taped. Please check out my other Shure wireless items that I have on auction currently. This item worked perfectly when last used. Please check out my feedback and , thanks for looking!