What device do I need for a digital menu board?

You don't need special signage hardware. Any inexpensive streaming device that runs Android TV, Google TV or Fire TV will work.

The lowest-cost pick is the Walmart Onn Google TV 4K box (around $20–30). The Amazon Fire TV Stick 4K is widely available and reliable. If you're buying a new TV anyway, get one with Fire TV or Google TV built in (such as an Insignia or Toshiba Fire TV) and install Dispry directly — no separate box.

Dispry launches by itself when the device powers on, so the menu is back after any power blip and staff aren't tempted to open other apps.