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Description:Detailed Selling Lead Description 1) Industrial GSM module 2) Menu in English and Chinese 3) Voice volume adjustable 4) Built-in charging system 5) Internal Li-Ni backup battery 6) Support English and Chinese SMS 7) Display of dialing calls, incoming calls and missed calls 8) Preset local handset numbers and block numbers 9) Locking network, SIM card, and machine and card together 10) Preset local prefix and IP access number 11) GPRS wireless online