2. Lithium Battery Interface 3. SIM Card Protection IC 4. Micro SIM Card 5. Other control interface 6. Mic Voice Terminal 7. USB interface (only for upgrade use, the standard is not soldering) 8. Tantalum capacitor 9. TTL output high selection (standard 5 V) 10. TTL level adjustment 11. circuit IPX antenna interface GSM 12. 5V power supply and serial interface 13. TVS pressure line 14. Bluetooth antenna interface (standard is not soldering) 15. LDO power supply 16. LED light 17.antenna power supply GPS 18.antenna interface (connect standard with active antenna) GPS To achieve the basic module via the serial interface AT send commands to control, use this module only requires a power supply and a serial interface.
