Functions: 1.With large LCD screen. 2.Realize managed by center network management system. ply to technology requirements and testing means for Multi-ports meter promulgated Ministry of information industry of the People's Republic of china. 4.Can be input many kinds of tariff rate, such as rates of international, internal, local, specialism, free and forbidden call 5.Signal for billing startup: polar-reverse, 12/16Khz pulse, manual or delay automatically. 6.Identify call number automatically and the tolerance is less than 1 second. 7.Can trace the last 1000 records of telephone number, duration, total sum. 8.Total automatically daily subtotal sum and the last 32-day grandtotal amount. 9.With inner modem, supporting the function of network center manage, tariff rate download and phone bill upload. 10.Anti- lightning , anti-jamming design and the steady performance. 11.With rechargeable batteries, It can work 8 hours at least after power cut . 12.Remote display box for option 13.Function of printing phone bill for option Conditions: 1) Environment: away from rain, sun, high temperature, dust, alkali, acid, strong vibration situation or strong electromagnetic wave 2) Atmospheric pressure: 86KPa - 106KPa 3) Relative humidity: 10% - 90% 4) Noise: <60dB 5) Temperature: -10癈 - 40癈 Technology standards: 1) Timing accuracy: <1 sec 2) DTMF receiving standard: >=-23dBm 3) Incoming receiving accuracy: >99.99% 4) ion loss: <=0.5Db Notice: 1) Meter should work in ventilated and clean surrounding. Be away from rain, sun, high temperature, dust, alkali, acid, strong vibration situation or strong electromagnetic wave 2) Please unplug the power source and telephone lines to avoid lightning strike 3) The meter is a precision electronic instrument, please dont assign, take apart, test or change tariff rate by unskilled person, which should be operated by skillful serviceman 4) While transfer rate to the meter from center management system, please plug the special line (6 core RJ connector) provided by manufacturer the communication port 5) If with rechargeable batteries, please recharge the batteries at least 12 hours in the first time 6) The meter keeps on working about 8 hours while the local power is cut