1.        Special MCU processor

2.        Over voltage and over current protection

3.        Line state detection

4.        Incoming call number upload

5.        Host computer control Off-hook and on hook

6.        Power input：12VDC,  Range：9～24VDC

7.        Power dissipation：<1W

8.        Phone port：RJ11

9.        Comm. port：RS232、USB

10.    Comm. parameters：9600bps，N，8，1

11.    Size：155mm*100mm*45mm

12.    Work environment：-10℃～50℃，0%～95%RH，No condensation