It is based on ST4-TB3 but add. one 10G Lan port. Users can connect 4 hard drives and Internet/Intranet through one Thunderbolt 3 cable at the same time. The RAID controller and Thunderbolt 3 bridge are the same as ST4-TB3. Use Aquantia AQC107S for 10G Lan. It is an end-point device. Target users will be those people who have to access more than one data hard drive at the same time, with or without RAID function may not be their major concern. Designed with 4 hot-swap hard drive Trays , user can change the hard drives with easy and no need to power off.