Detailed Product Description

Features: 
1) Monitor 4 or 8 lines of phone working state separately
2) Start charging by means of polar-reverse, manually and automatic delay
3) Supply incoming-call free or charge
4) Store up to 50,000 phone bills, and daily records of the latest 366 days
5) Powerful statistic and print function
6) Supply multi-operator mood
7) Transmit tariff rate, clock, initialization and upgrade program rapidly by 
    serial communication tool
8) Rechargeable battery lasts up to 8 hours
9) Each phone line has a remote display for a caller
10) Realize wireless access by wireless conversion pool