Type:SMS Modem of Channels:16 Frequency:GSM GPR 1900MHz Encryption:RC4, VOS and Ejoin private etc. Firmware Update:Local file, FTP, TFTP and HTTP Network Protocols:IPv4, TCP, UDP, PPPoE, DHCP, DNS, NAT, Telnet, HTTP, FTP, TFTP SMS Control Protocols:EPSIP (Ejoin Private SMS Internet Protocol) Power Supply:100-240VAC, 50 - 60 Hz Weight:4kg Warranty:12 Months