US's Square buttons are square as the name implies, with black halos angled slightly up.

Produced 1971-1981
Rarity Rating: 8/10

US's 'Circle' buttons were introduced in the late 1970s. Indicators usually are made up of the same circle buttons, though some traction elevators have a red LED display flanked on either side by a circle arrow segment.

Produced 1980-1993
Rarity Rating: 5/10

These fixtures are extremely rare. They're just like Circle but the button is metal and the number or arrow in the center lights up. Only a few elevators are known to still have these.

Soft Touch was US's standard fixture when the company was owned by Thyssen in the 1990s. Soft Touch buttons are pressure sensitive, round black buttons with red LED halos, similar in appearance to ThyssenKrupp Aurora. These were paired with a red dot-matrix LED indicator, and a color-changing arrow lantern.

Soft Touch is now very rare, as most original installations have have had their buttons replaced with ThyssenKrupp Aurora or MAD BS.

Produced 1993-1999
Rarity Rating: 7/10