I used this monitor for a while and no longer need it. Works 100% and no dead pixels.

Acer CB281HK bmjdpr 28" 4K Ultra HD monitor with 3840x2160 resolution, 1ms response time and AMD FreeSync. It has DVI, HDMI (MHL) and DisplayPort inputs and built-in speakers.

Details
Brand: Acer
Model: CB281HK bmjdpr
Part number: UM.PB1AA.001
UPC: 888863343836
Screen size: 28"
Resolution: 4K UHD 3840x2160
Panel type: TN
Response time: 1ms GTG
Brightness: 300 cd/m2
Inputs: DVI-DL, HDMI (MHL), DisplayPort
Speakers: 2W x2 built-in
Adaptive sync: AMD FreeSync
Color: Black
Manufacture date: June 2017

Included:
Acer CB281HK monitor with stand
Original box
All original included items
Last photo is a manufacturer stock photo.

Terms:
Everything I list is in good working condition unless I specifically state otherwise.
US buyers only. FREIGHT FORWARDING addressed will be cancelled. I do address searches.
Make sure your address is correct before purchase. I will not change the shipping address after.
I pack each and every item very well. The post office can be rough on packages.
I usually ship within 2-3 days of purchase.
Check my response, buy (or offer) with confidence.
Thank you for looking!