What safety features does the electric height-adjustable mobile stand include?

The stand includes a safety stop mechanism that reverses direction briefly if an obstruction is encountered.

What is the maximum display size that the Smart Technologies Electric Height-Adjustable Mobile Stand can support?

The maximum display size the stand can support is 86 inches (218 cm) diagonal.

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Smart Technologies Electric Height-Adjustable Mobile Stand - Black (FSE-420-C1)

Designed for the current line of SMART Board interactive enterprise displays in North America, the SMART electric height-adjustable mobile stand features 26" (66 cm) of powered height adjustment. Safety features include a safety stop mechanism that reverses direction briefly if an obstruction is encountered.
With its wide footprint and sturdy steel frame, the stand supports displays up to 86" (218 cm) diagonal that weigh up to 200 lb. (91 kg).
The stand supports a maximum weight of 228 lb. (103 kg) with a display and accessories.
You can easily roll the stand across smooth floors and secure it in place with the industrial grade 4" locking casters.
The stand has a UL-certified drive system, is certified to UL 962 for Usage Area IA, and complies with Americans with Disabilities Act (ADA) standards.
It also includes VESA mounting points for easy installation of the display and peripherals, a locking storage cabinet, and a surge-protected power bar.