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All "In The Zone" Lift & Lock keyboard tray systems feature the articulating arm mechanism:

Simply lift keyboard tray to desired height, press down slightly to lock into place.
• Height indicator provides 3 zones of comfort, with 3 levels per zone for 9 unique height settings.
• Tilt mechanism for maximum wrist comfort.
• 8-position tilt indicator for precise tilt adjustment.
• Low-profile arm bracket allows for height adjustment from bottom of worksurface to 5" below.
• 21"L x 5 3/4"W glide track for extension and retraction.
• All-steel construction.

Specific to CMLZO449CH:

When it comes to workplace ergonomics, a challenging desk configuration doesn’t have to challenge your comfort. “The Universal Solution”, Sunway’s OrbitTM keyboard tray, accommodates almost any shape workspace from diagonal to radius to 90º corners.

• Constructed of thin but durable 1/4" thick composite phenolic material
• Overall tray dimensions: 20 3/4”w x 11 3/4”d; OrbitTM shaped tray
• Full bullnose edge for a soft look and durable feel
• Cut out on keyboard tray provides convenient storage of mouse when not in use
• 10”w x 8.5”d (overall) swivel mouse trays attached to both sides of keyboard tray.
• Swivel mouse trays come complete with mouse pad and edge guard material
• A 19”w x 3”d Orbit shaped, gel wrist pad in leatherette vinyl conforms to the front of the keyboard tray
• Some assembly required; mounting hardware included

Color: Trays are Charcoal phenolic (black with gray specks) – CH. Wrist pad is black vinyl.