here I have my 4k samsung monitor for sale

Its fully working order no problems at all

the specs are

Resolution 3840 x 2160

Response Time 1 ms 

Refresh Rate 60 Hz

full detailed specs are on the samsung website

https://www.samsung.com/uk/business/business-monitors/professional-uhd-lu28e85krs/lu28e85krsen/

It will be shown working before purchase

£250

call or text for more information on
07375535730

I will put some put some pics of it soon