Chipset: SIM800L  

Operating Voltage: 3.7-4.2V  

Supported Networks: Global quad-band GSM  

Module Dimensions: 2.5 cm x 2.3 cm  

Interface: TTL serial port, directly connectable to a microcontroller (no need for a MAX232 converter)  

Power:

Automatically boots and connects to the network  

Signal Indicator: Onboard LED flashes slowly when connected, and flashes quickly when no signal is detected

Key Features:

- Supports quad-band frequencies: 850/900/1800/1900MHz

- Compatible with any global GSM network using a 2G SIM card

- Capable of making and receiving voice calls with a headset or an external speaker and an electret microphone

- Supports sending and receiving SMS messages

- Handles GPRS data transmission (TCP/IP, HTTP, etc.)

- Provides GSM-based location tracking (not GPS)

- AT command interface with automatic baud rate detection