This is an "Analog Pass-Through DTV Converter Box" made by Nhens Digital, Inc., model DSP7700P.
The box is gray and black and features an English and Spanish on-screen display menu, automatic time setting, parental control, advanced closed captioning, channel 3/4 output for analog television, and is capable of receiving major and minor free HDTV off-air signals.
It measures approximately 10.75" tall, 9" wide, and 2" deep.
This box comes in great pre-owned condition, sealed in the original box.