KitsGuru SIM800L GPRS GSM Module MicroSIM Card Core Board Quad-band TTL Serial Port Electronic Components Electronic Hobby Kit

Description:GSM (Global System for Mobile communications) is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation digital cellular networks used by mobile devices such as tablets, first deployed in Finland in December 1991.[2] As of 2014, it has become the global standard for mobile communications – with over 90% market share, operating in over 193 countries and territories. 2G networks developed as a replacement for first generation (1G) analog cellular networks, and the GSM standard originally described as a digital, circuit-switched network optimized for full duplex voice telephony. This expanded over time to include data communications, first by circuit-switched transport, then by packet data transport via GPRS (General Packet Radio Services) and EDGE (Enhanced Data rates for GSM Evolution, or EGPRS).Technical Parameter:1. Chip: SIM800L2. Voltage: 3.7-4.2V3. Support networks: China Mobile, China Unicom and global quad-band network4. Module size: 2.5cmx2.3cm5. TTL serial port for serial port, you can link directly to the microcontroller. No need MAX2326. Power module automatically boot, homing network7. Onboard signal lights all the way . It flashes slowly when there is a signal, it flashes quickly when there is no signal