1. High protection: We researched and developed an innovative sealing on module surface with transparent epoxy glue, the so called GOB technology. It has a great protection of the led on the PCB, good enough to use in the extremely harsh environment, realizing the exact waterproof, dust proof, anti-uv and anti crash, and avoiding the light lamp dropping phenomena. 2. Don't need to calibrate: we would calibrate the screen well before delivery, so when you change the spare modules, you don't need to recalibrate. 3. Professional displaying performance: use ultra high refresh rate IC and high quality LED chip, low brightness, high grey scale, ultra high contrast, together with the technology of super high refresh rate and image sharpening, the screen has large viewing angle and wide color gamut, all these would generate the wonderful visual feast. 4.secure and stable: power supply and receiving card support hot-plug and double backup according to your demand to assure everything goes smooth in site. 5.installation and maintenance: quick installation and disassembly, 500x500mm and 500x1000mm die casting aluminum cabinet, support Mix&Match and module front or back maintenance, as well as hot plug of modules and cables