SIM900A GSM/GPRS Module with Antenna – Dual Band 900/1800MHz for SMS, Voice, and Internet

The SIM900A GSM/GPRS Module is a compact and reliable communication module based on the SIMCOM SIM900A chipset, ideal for GSM-based applications such as SMS, voice calls, and low-bandwidth internet connectivity. This module operates on dual-band GSM networks (900/1800 MHz) and comes with a high-gain external antenna, ensuring stable and extended signal reception.

Whether you're building an IoT project, SMS alert system, remote data logger, or GSM-based automation system, this module provides a plug-and-play solution with TTL-level serial communication compatibility — perfect for integration with microcontrollers like Arduino, AVR, PIC, 8051, STM32, and Raspberry Pi.

Key Features:

• ✅ SIM900A GSM/GPRS chipset – Proven stability and wide compatibility

• ✅ Dual-band 900/1800 MHz support – Works across most 2G GSM networks in India

• ✅ Supports Voice, SMS, and GPRS (Internet)

• ✅ TTL serial interface (RS232 level conversion required for PC)

• ✅ Onboard power supply circuit with voltage regulation

• ✅ Includes SMA Antenna for better reception

• ✅ LED indicators for network status and power

• ✅ Compact, lightweight, and easy to integrate

Technical Specifications:

• Operating Voltage: 12V DC (recommended)

• Frequency Band: GSM 900/1800 MHz

• Baud Rate: 1200 to 115200 bps (default: 9600 bps)

• Communication Interface: UART (TTL level)

• SIM Slot: Standard SIM

• Antenna: External SMA Antenna included

• Dimensions: Approx. 48mm x 45mm

• Weight: ~20g (with antenna)

Applications:

• 📱 GSM-based Remote Monitoring Systems

• 📶 IoT Devices with GPRS Communication

• 📤 SMS Alert & Notification Systems

• 📞 Voice Call & Call Alert Integration

• 🔐 Home/Industrial Security Systems

• 🚨 Emergency Communication Devices

Package Includes:

• 1 × SIM900A GSM Module

• 1 × External SMA Antenna