What durability features does the PowerScan PM9100 have for industrial use?

It has an IP65 rating and is drop resistant from up to 2.0 m / 6.6 ft.

What cordless communication system does the PowerScan PM9100 use, and what radio frequency is specified?

It uses Datalogic’s STAR Cordless System with narrow band radio at 910 MHz.

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Datalogic PowerScan PM9100 Industrial Laser 1D Linear Imager with Datalogic’s STAR Cordless System, 910 MHz, Removable Battery - PM9100-910RB

The PowerScan PM9100 linear imager is a cordless device offering state-of-the-art performance in an industrial product and features Datalogic’s STAR Cordless System narrow band radio
This linear imager introduces Datalogic’s new and innovative scanning technology, implementing a green scanning line which has the same definition of a laser beam with all the benefits of a linear imager
Also features Datalogic’s exclusive 3 Green Lights (3GL) for superior good read feedback; the patented ‘Green Spot’ technology directly on the code and dual Good Read LEDs on the top of the cap increase visibility at any angle
IP65 rating and 2.0 m / 6.6 ft drop resistance
Front window replaceable in-field & user replaceable Li-Ion battery
Requires Base (BC9030-910), Power Adapter & 110V US Cord (8-0935 & 6003-0941)