1. Built-in high performance, low power microcontroller;
2. Peripheral features;
    2.1. Support 4-20mA and 0-5V/10v two given;
    2.2. Two switch inputs;
    2.3. Wide range of primary loop voltage(AC110--440V);
3. Efficient cooling solution, such small size, light weight;
4. Practical alarm function;
    4.1. Phase failure;
    4.2. Overheat;
    4.3  Overcurrent;
    4.4. Load break;
5. One relay output, 3A AC250V, 3A DC30V;
6. To facilitate centralized control RS485 communication;