Except of the transmission of telephone voice, SMS, MMS, GPRS data (support transmission mode, domain name resolution and IP mode), this module has DTMF decoding (recognizing key bottons on other side), TTS (optional Local Voice broadcast) and Bluetooth (optional). Hardware design was optimized in the official design, using efficient switching power supply. SIM card using mainstream MICRO card holder, the quality is more robust.

Applications：

Remote monitoring, remote intelligent meter reading, remote communication equipment such as smart home and on-board equipment.

Basic functions：

1.The SIM800 is a GSM/GPRS quad bands module of Simcom Company. 1)dial/answer/SMS/GPRS communication; working band=850/900/1800/1900/MHz, Serial Baud Rate: 1200~460800bps; 2)control mode: AT command (3GPP TS27.007); 3)extensions: MMS/DTMF/TTS/Bluetooth; 4)2*3.5 interfaces, Micro SIM socket; 5)Input voltage:DC5V~15V2A. This development board supports Unicom mobile 2G/3G/4G card.

2. DC5V~18V wide voltage power supply, it is convenient to use your system power supply. The board's high performance DC-DC power supply circuit together with TVS protection, greatly improved  the stability of the system.

3. Support 3.3V/5V TTL level control, convenient to communicate with PC and all kinds of single chip microcomputer, such as ARDUINO/51/STM32, etc. The module lists the use of TX/RX/GND separately, and it is convenient to use.

4. With headset and Mic interfaces, it is easy to test GSM voice calls.

5. Static electricity protection with SIM card to protect against static electricity generated when the SIM card is plugged in/out.

6. Reserved USB Interface and Bluetooth Interface for extended uses

7. With NET_STA lindicator, it is easy to view the current status of SIM800.

8. Dimensions: 50mm*55mm