This indoor integrated 3 in 1 full color series is Made of 5052 aluminum, low lead tolerance, high rigidity which keeps the display contact area flat and is not deformative. Easy installation, lock cabinets tightly in vertical. Precise size guarantee of cabinet keeps less than 0.2mm diagonal error when cabinets connected. Wire drawing boron coating , makes cabinet cool and quiet. Neutrik socket,with quality of high reliability. Black face, high contrast ratio. Multiple location pin make cabinets in the same level when connected. Fast lock, lock cabinets tightly in vertical.