- Single key for switching between auto and manual mode.
 - Additional left key for adjusting the number, making parameter settings faster and handler.
 - Displaying output percentage for the user to acquire the openness of the valve immediately.
 - Control methods are designed entirely for the features of electronic valve.
 - DTV have two groups of alarm outputs with 17 modes, for more choices of applications.
 - The RS-485 interface allows collecting data from many devices through network on-line monitoring