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SIM800L GPRS Module w/ PCB Antenna Bomb Slot Automatic Micro SIM Card
Description: Operating voltage: 3.7~4.2V (peak current 2A£¬ please be prepared to handle) Module size: 2.2cm * 1.8cm TTL serial port can be used with a direct link to the microcontroller. No need MAX232 Power on the module automatically boot automatically search network Onboard signal lights (with signal flash slowly£¬ no signal flash quickly) The world's smallest size£¬ absolutely no smaller than this GSM module.