Just like 8 single-channel equipments work at the same time. Insert 8 SIM cards (big or small). Connection with the computer through a data line can be integrated with Serial 8. Each channel with separate power switch. Each individual module is demolished. Industrial chassis, elegant shell. GSM frequency: 900/1800 MHZ. 8 SIM card (big/small) slots. Wireless access to internet. Comply with GSM phase2 standard. Dual-band and Quad-band (optional). RS-232/USB interface (optional). 8 SIM Card supported (Big/Small). Optional data, voice function. Send and receive English SMS in bulk. Q2403A has great application in various arenas like large shopping malls, supermarkets, Professional market, and large wholesaler’s large hotels, large-scale entertainment, large agencies, Transport, logistics industry, large enterprises, and institutions Large hospitals, large bookstore, Newspaper, television and radio stations, Oil Company (other chain business model), Government agencies or large township.