... and accurate billing features 4. best prices Name: GSM Phone Billing MeterModel: SV-G50 Main features: Useful for payphone to ... Output voltage: DC12V Output current: 1000Ma Back-up battery(optional):Ni-MH battery, 1.2v/1200mAh,4pcs Antenna: Frequency based: 890 ... 165*90mm, Weight: 1.41(including the antenna, battery, power adaptor) GSM Wireless Phone Billing Meter / Billing Meter for call shops/Routing ...