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Package Included: 1*GPRS adapter board and accessories Specifications: By default, the row needles are not welded, so as to reserve more expansion space for customers Module model: SIM800L (the latest module, with performance exceeding SIM900/M590) Working voltage: 3.7~4.2V (peak current is 1A, please handle it properly) Supporting networks: China Mobile, China Unicom and the global four-frequency network Module size: 2.5cmx2.3cm Serial port is TTL serial port, which can be directly linked with MCU. MAX232 is not required The module is powered on and started automatically, and the network is searched automatically On-board one-way signal indicator lamp (with signal flashing slowly, without signal flashing) Small size, there is no GSM module smaller than this module Full machine chip processing, reflow soldering, stable performance factory direct sales Description: SIM800L module can support 4-band GSM/GPRS, and the working frequency bands are GSM850, EGSM900, DCS1800 and PCS1900MHz. The size of the module is only 17.815.82.4 mm, which can almost meet the requirements of space size in all user applications. The physical interface between the module and the user is 88Pin LGA pad, which provides all the hardware interfaces of the module. Up to 50 keys can be supported. All the way full function serial port. One USB interface can simulate one serial port, which is convenient for users to debug and download software Two audio interfaces, including microphone input and receiver output. Programmable general purpose input/output interface (GPIO). All-way SIM card interface Support FM function Pwm function pin SIM800L is designed with power-saving technology, which consumes as little as 1.11 mA in sleep mode. Module configuration: GSM： 850、900、1800、1900MHz BT: Not supported FLASH： 24Mbit RAM ： 32Mbit Main features of module: Characteristics: Description Power supply: voltage range: 3.4V ~4.4V Power saving: the current consumption in SLEEP mode is 1.11mA(AT+CFUN=0) Band: Four bands: GSM850, EGSM900, DCS1800, PCS1900, which can automatically search for four bands. You can also set the frequency band through the AT command. Comply with GSM Phase 2/2+ GSM type: small mobile station Transmit power class 4 (2w): gsm850, EGSM900  Class 1 (1W)：DCS1800、PCS1900 GPRS connection feature GPRS time slot defaults to level 12 Gprs time slots class8, 10 and 12 are optional Gprs mobile station class b Temperature range Working temperature:-40℃ ~+85℃ Storage temperature: -45℃ ~ +90℃ GPRS data characteristics GPRS data downlink transmission: maximum 85.6kbps. Uplink transmission of GPRS data: maximum 85.6kbps. Coding formats: CS-1, CS-2, CS-3 and CS-4 PAP (password authentication protocol), which is usually used for PPP connection, is supported Embedded TCP/IP protocol Support packet broadcast control channel (PBCCH) Transmission rate: 2.4, 4.8, 9.6, 14.4 kbps Unstructured supplementary data Service (USSD)