| Chip: SIM800L. |
| Voltage: 3.7-4.2V. |
| Support networks: China Mobile, China Unicom and global quad-band network. |
| Module size: 2.5cmx2.3cm. |
| TTL serial port for serial port, you can link directly to the microcontroller. No need MAX232. |
| Power module automatically boot, homing network. |
| Onboard signal lights all the way . It flashes slowly when there is a signal, it flashes quickly when there is no signal. |
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