The RS 6661A-2U2e transforms a single Thunderbolt™ 3 port into an all-purpose external connectivity solution. 
 
RS6661A-2U2e key features:
Thunderbolt™ 3 to 2x USB 3.0 + 2x 6Gb/s eSATA
All-purpose Storage Expansion Solution for Thunderbolt™ 3 Connectivity
Each eSATA port supports SATA HDD/SSD up to 14TB
USB Type-A ports support any USB 3.0/2.0 device
Works with any Thunderbolt™ 3 capable Mac or PC