Comes with original box, manual, and power supply. Specifications in photos.
The ELAN MOD4000 is a four-channel, digitally-tuned video modulator that converts any baseband video and audio signal to UHF or Ultraband CATV. An internal quartz crystal reference oscillator and PLL circuitry ensure drift-free performance. Any TV connected to the output via coax cable can receive any of the four signals when the TV is tuned to the proper channel.
Manual: http://www.elanportal.com/supportdocs/catalog/sw-im-mod4000.pdf