Just purchased this modem online, without a power supply. Does anyone know the input voltage?

Information from the modem is as follows:

in upper left hand corner, on bottom:

1.021.018-C

FCC Reg # CJEUSA-65828-FA-E

Sportster FC Model 0413

Thanks in advance for any help you can provide....

My guess is it is 9VAC input, put if anyone has a power cord they could check out, I will be very grateful.