... control ( GSM 07.07 and 07.05) gsm modem with external antenna Application ♦ Large shopping malls, supermarkets♦ Professional market, ... model)♦ Government agencies or large township gsm modem with external antenna Hardware Feature ♦upport dual band:900/1800 MHz ... - + 70 ° C♦Size: standard 1U chassis gsm modem with external antenna Supported operating systems-Windows 7 (Home, Premium, Pro, Ultimate ...