1)Adopt 4-digital technology, can support 999-extensions.

2)can save 10 caller numbers, can inquire and call back.

3)can call out,monitor substation,intercom by duplex,call troop & group and etc.

4)Have output connector for alarm, can connect to alarm lights, have connector for recording

5)can be connected to computer through the link 232 to help remember and manage the calling information