Module Overview

This is a compact GSM/GPRS communication module based on the SIM800L chip, designed for easy integration with microcontrollers via a serial interface.

Key Specifications

• Core Chip: SIM800L
• Operating Voltage: 3.7V - 4.2V
• Supported Networks: Quad-band (850/900/1800/1900 MHz), compatible with carriers such as China Mobile and China Unicom for global coverage.
• Interface: TTL Serial Port (UART) for direct connection to a microcontroller, eliminating the need for a MAX232 level converter.
• Module Dimensions: 2.5 cm x 2.3 cm
• Indicator LED: Features an onboard network status LED.

1. Slow Flash: Module has registered to the network (signal present).
2. Rapid Flash: Searching for or not registered to a network (no signal).

Key Features

Automatic Operation: Powers on and automatically searches for a network upon application of correct voltage.

Compact & Integrated: Small form factor with all essential components onboard.