Comparison between NT644 and NT644 pro


What is the difference between the NT644 and NT644 pro?
Here is the comparison table between NT644 and NT644 Pro:

Foxwell Model NT644                       NT644 Pro         
Works on almost all electronic systems
OBDI and OBDII compatiblity
Reads and clear codes
Reads/records/graphs live sensor data
Freeze frame data
ECU information
Multilingual menu and codes 
Code troubleshooters
Hot keys for quick access of data
Bi-directional control tests  
EPB Service 
Oil Light Reset 
DPF Reset  
SAS(Steering Angle Sensor Calibration)    
Battery Configuration  
TPS/TBA(Throttle Body Alignment)  
Other Service Maintenance Function  
18-month free updates
Yearly Update Cost(beyond free period) 100USD 100USD