Elo TouchSystems ET1903LM User Manual page 12

Wall Mount
Mount the wall bracket to the wall using six fasteners appropriate for the type of wall material and following all applicable building code standards.
Ensure the unit is mounted to a solid structure and surface, such as a support beam or wall.
Attach the other bracket to the monitor using the four M4 screws included in the kit.
Hang the monitor on the wall bracket and secure using two M3 screws included with the kit on the left and right side of the bracket.
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User Manual ET1903LM, ET2203LM, ET2403LM, ET2703LM REVB