This is the standard DISH Pro Dual LNBF used with the DISH Network DISH 300, older DISH 500 models, and the original DISH 1000 Satellite Dish Antenna  (dish sold separately)
This LNBF typically receives programming from the 110 satellites.
Requires DISH 300, 500 or 1000 Satellite Dish Antenna (sold separately) to be a complete ODU (outdoor unit)

Dish Network Part # 120810

This LNBF typically receives programming from the 110 satellites.

Requires DISH 300, DISH 500 or DISH 1000 Satellite Dish Antenna (sold separately)

This DISH Pro Dual LNB is the standalone LNB that was used on the older single LNB DISH 300 systems and two of them were used at one time with the DISH 500 models before the "twin" heads were released.  This LNB is also used for the 129 satellite on DISH 1000 antenna systems.  This DISH 1000.2 used one slender head instead.