USB cable is under 1 m.
I don't know if the HDMI cable is certified.
I tested my macbook with another display (philips 4K 32'') and it works. I also tested my usb cable in this monitor and it works.
When I check the system report (with my dell display connected) I get contradictory information. Sometimes it recognises it as a 5K display and sometimes as a 4K display. I attach this information (with the laptop open and closed).
Laptop open:
Intel Iris Plus Graphics:
Chipset Model: Intel Iris Plus Graphics
Type: GPU
Bus: Built-In
VRAM (Dynamic, Max): 1536 MB
Vendor: Intel
Device ID: 0x8a53
Revision ID: 0x0007
Metal Support: Metal 3
Displays:
Color LCD:
Display Type: Built-In Retina LCD
Resolution: 2560 x 1600 Retina
Framebuffer Depth: 30-Bit Color (ARGB2101010)
Mirror: Off
Online: Yes
Automatically Adjust Brightness: Yes
Connection Type: Internal
DELL S2722QC:
Resolution: 3840 x 2160 (2160p/4K UHD 1 - Ultra High Definition)
UI Looks like: 1920 x 1080 @ 60.00Hz
Framebuffer Depth: 30-Bit Color (ARGB2101010)
Display Serial Number: HM65MD3
Main Display: Yes
Mirror: Off
Online: Yes
Rotation: Supported
Connection Type: Thunderbolt/DisplayPort
Laptop closed:
Intel Iris Plus Graphics:
Chipset Model: Intel Iris Plus Graphics
Type: GPU
Bus: Built-In
VRAM (Dynamic, Max): 1536 MB
Vendor: Intel
Device ID: 0x8a53
Revision ID: 0x0007
Metal Support: Metal 3
Displays:
DELL S2722QC:
Resolution: 5120 x 2880 (5K/UHD+ - Ultra High Definition Plus)
UI Looks like: 2560 x 1440 @ 60.00Hz
Framebuffer Depth: 30-Bit Color (ARGB2101010)
Display Serial Number: HM65MD3
Main Display: Yes
Mirror: Off
Online: Yes
Rotation: Supported
Connection Type: Thunderbolt/DisplayPort
My MacBook Pro:
Hardware Overview:
Model Name: MacBook Pro
Model Identifier: MacBookPro16,2
Processor Name: Quad-Core Intel Core i7
Processor Speed: 2,3 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 512 KB
L3 Cache: 8 MB
Hyper-Threading Technology: Enabled
Memory: 16 GB
System Firmware Version: 1968.140.7.0.0 (iBridge: 20.16.6072.0.0,0)
OS Loader Version: 577.140.2~15
Serial Number (system): C02D52XMML85
Hardware UUID: A0BA96D7-D3A2-537B-A280-0E04B7336D0C
Provisioning UDID: A0BA96D7-D3A2-537B-A280-0E04B7336D0C
Activation Lock Status: Enabled