The 9950 SmartPro Transmitter takes a simple approach to modularity. Choose from DC powered only or AC/DC powered system. The 9950 is ready to run out of the box with its standard two 4 to 20 mA passive outputs. Add optional relay modules and binary inputs, and transform your SmartPro in to a two channel controller. With onboard clock/calendar, derived functions, and advanced relay operation, you have seemingly countless configurations to meet your process control needs.