For USB-C I use a CABLETIME 4k/60hz cable http://www.amazon.com/Adapter-CABLETIME-Thunderbolt-Compatible-ChromeBook/dp/B082XQL1WS?th=1 and the monitor is a Benq G2420HD, Full HD, DVI, HDMI,
Senseye+photo. It does not work on the DVI input, but on the HDMI it works.