• On Board Power regulator, works on 12V 2A DC Power Switch,
• Reset Switch,
• Power LED
• Ring LED
• Network LED
• UART Serial DB9 Connector
• TTL Pins
• And external Interfacing Pins.
• On board TTL pins can be used to interface with the microcontrollers. 

Applications:

• Industrial automation.
• GPRS based data logging.
• GPRS and GPS application.
• Home automation.
• Health monitoring.
• Agriculture automation.
• Vehicle tracking.
• Remote monitoring and controlling.
• GPRS based Weather report logging.
• GSM GPRS based Security alert.
• GPRS based remote terminal for file transfer.
• IVRS.
• Bulk SMS sending etc.

This is a GSM modem sim 800. There are so many GPRS/GSM modules on the market which need to add 5V regulator and level converter circuit, while SIM800  GSM/GPRS module already has a built-in regulator circuit and TTL level converter on the board. The IPX antenna, the antenna interface can be arbitrary switching PCB glue stick antenna and suction cups. SIM800 frequency communications, data available in the world. Do the foreign trade and foreign trade projects preferred.