GSM MODEM Make with Siemens TC35I Dual-band EGSM900/GSM1800 Data, Voice, SMS and Fax Product PerformanceDouble frequency GSM modemIts design and the ... 1900MHzInput voltage5V-24VDCInput current1A-2A5mA readiness for action, 140mA in GSM 900MHz 12V telephone conversation condition5mA readiness for action, 100mA in ... data and the pronunciation ties (may choose part) RS232 TC35I GSM MODEM(900/1800MHZ)