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1)? onboard TC35 dual-frequency 900/1800MHZ highly integrated GSM module;2)? The onboard LM2596 high-power power supply chip, powerful guarantee modules to work stably for a long time;
3)?The onboard flip type SIM card, SIM card users convenient loading and unloading;
4 )?on-board terminals or DC power supply (the default is terminal), 7.5-12V input voltage;
5)?The onboard audio interface and a microphone, is convenient for the user to do a test call;
6)? on-board UART interface, to meet the needs of different users;
7)?onboard three LED lights: the power indicator light, signal light, call indicator light;
8)?.PCB board size: 68.5 (mm) x38.5 (mm)
