Sell telephone call tariff meter

Visiontek 31C is single line PCO Pay Phone call charge monitor for PSTN / Fixed line / Fixed Wireless ( CDMA and TDMA ) connectivity. This product typically conceptualizes man-attended payphones. The developing nations have experimented with this concept. The technology did produce astonishing results and also created employment opportunities to socially backward and unemployed youth.
The PCO Call Charge Monitor incorporates an advanced Micro Controller (80C31 ) based technology with 32K RAM & 64K ROM capacity. The system can be operated with 230V AC/50 Hz( or ) 12V, 5AH Lead Acid battery. Works on both PULSE / DTMF dialing on 16 KHz metering and has battery back up in the event of power failure. Also has a Power saving mode to conserve battery.