RoboVendor SIM800L Educational 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: SIM800L 2. Voltage: 3.7-4.2V 3. Support networks: China Mobile, China Unicom and global quad-band network 4. Module size: 2.5cmx2.3cm 5. TTL serial port for serial port, you can link directly to the microcontroller. No need MAX232 6. Power module automatically boot, homing network 7. Onboard signal lights all the way . It flashes slowly when there is a signal, it flashes quickly when there is no signal