What is the different feature between Smart UPS On-Line SURT and SRT?

There are some different feature between Smart UPS On-Line SURT and SRT.
You may refer to the generation comparison as below.

Feature	Smart UPS RT (SURT)	Smart UPS SRT
Double Conversion On-Line Topology	X	X
Rack Tower Convertible	X	X
Smart Slot	X	X
+/- 1% Output Voltage Regulation	X	X
Automatic Bypass	X	X
Hot Swap User Replaceable Batteries	X	X
Dual Input SURT : 15kVA & 10kVA 230V only SRT: 8kVA & 10kVA 230V only	X	X
Auto Detect External Battery Packs		X
Predictive Replacement Battery Date		X
Multi color Graphical LCD		X
Unity Output Power Factor (6kVA-10kVA Models)		X
Start Without Battery		X
Energy Star (208 models) and Green Mode		X
Switched Outlet Groups		X

Released for:Schneider Electric Thailand