1.All of the controller series is AC 220V, If you have special voltage requirements, please contact us in advance. 2. All of the controller series is TC input, single output, we can change input K/ J/ S from menu, output only one of Relay/SSR please choose as your requirement when we place the order. 3. mA is 4-20mA PID output, not linear output 4. If need other requirement please contact us , our factory manufacture controller more than 20 years. We can provide technical support and customized production of products. 5.This is a new type of temperature controller newly developed by our company. It has good PID adjustment ability, anti-interference ability and high accuracy.