Q1: which surface device is it compaitble with?
Answer: It works with Surface Pro 11/10/9/8/X/7/6/4/3/2017, Surface Laptop 7/6/5/4/3/2/1, Surface Laptop Go, Surface Book 3/2/1, but not for Surface Go 4/3/2/1.
Q2: why my product can’t work?
Answer: Please connect to your Surface devices in the right direction as shown in the picture.If in the wrong direction, it will only charge. Note: for Surface Laptop 7, the magnetic head should be inserted in opposite directon because of that Surface laptop 7 is different from others.
Q3: why cannot extend to 3 monitors?
Answer: If your CPU is older than 11th Gen Intel Core, when you extend to 3 monitors, you need to close your Surface screen and connect the DC power supply port and set up the right resolution.
If your CPU is above 11th Gen Intel Core, you can extend to extra 3 monitors without closing your Surface screen, and you need to connect the DC power supply and set up the right resolution.