GSM Coin Payphone with Working Frequency of 850/900/1, ... the last digit of input numberLCD displays time, coin amount input, count-down timer, setting content and ... desktop compatibleFixed/remotionAuto collect coinsLow power indicationPower supply: Inside payphone battery NiMH, 6V DC, 2,000mAhExternal adaptor:Input: ... in Advance or L/C at Sight GSM Coin Payphone with Working Frequency of 850/900/1,800/1 ...