... , MMS, TCP Protocol900/1800Q24plus-32SMS, MMS, TCP Protocol, remote control850/900/1800/1900 Key Features♦Just like 32 single-channel equipments work ... be demolished♦Industrial chassis, elegant shell♦GSM frequency: 850/900/1800/1900 MHz♦32 x SIM card(big/small) slots♦Wireless ... external antenna Hardware Feature ♦upport dual band:900/1800 MHz or quad-band GSM: 850/900/ 1800/1900 MHz♦ Meet the ETSI GSM 2 ...