Windows 10 Driver please note:
When using the Acer CB280HK monitor on Windows 10 please use the DisplayPort, as drivers are only available up to Windows 8.1 the DisplayPort ca handle the native 4K resolution only works at 60hz via a displayport 1.2
CB280HK Monitor Driver
File: Monitor_Acer_1.0_W7x86W7x64W8x86W8x64W81x86W81x64_A.zip
04bdb3d2e0e05c65599c0fd97d495a9fe5acabbdb17c09dd1215cce97d801a62
71.1 cm (28") - 16:9 - 4K UHD - Maximum Resolution 3840 x 2160 - Contrast Ratio 100,000,000:1 - Brightness 300 cd/m² - Colour Black