SIMATIC RTU3031C COMPACT LOW-POWER RTU; BATTERY OR SOLAR-OPERATED; CONNECTION EXT. POWER SUPPLY 10.8 V TO 28.8 V DC; INTEGRATED UMTS MODEM; GPS; CONNECTION TO TELECONTROL SERVER BASIC DNP3, IEC 60870-5-104 AND SINAUT ST7 PROTOCOL; ONBOARD I/OS: 8 DI, 8 DQ, 4 AI; FTP CLIENT; ETHERNET PORT, CONFIGURATION / DIAGNOSTICS VIA WEB SERVER, TIME-OF-DAY SYNCHRONIZATION, TEXT MESSAGE, EMAIL, SD CARD SLOT, OBSERVE NATIONAL APPROVALS!