... frequency, at the same time has radio frequency (RF) card realize prepayment manage mode 1. ApplicationIt is used ... 60Hz frequency, at the same time has radio frequency (RF) card realize prepayment manage mode, i.e. buy ... features2.1 Precise measure single phase AC energy2.2 RF card prepaid, one meter with one card, can ... ≤I ≤Imax0.5(L)±1.0±2.00.8(C)±1.0—— Sinlge-phase RF card prepaid kWh meter