Bluetooth- and Wi‑Fi‑based spying or monitoring devices suffer from limited range, making them ineffective for long-distance surveillance. This restricts their usefulness in critical security scenarios where monitoring is required across cities or countries. Additionally, bulky hardware makes discreet deployment difficult.
This project presents a compact GSM-based long-range surveillance device using the IndusBoard Coin and a SIM800L GSM module. By leveraging GSM voice calls, the device enables audio monitoring over virtually unlimited distances. Its coin-sized form factor allows easy concealment while maintaining reliable long-range communication.
Key Features
- GSM-based audio transmission with unlimited range
- Ultra-compact 3 cm form factor for discreet deployment
- Automatic call answering from a predefined phone number
- Real-time audio streaming via standard voice call
- Battery-powered operation using Li‑Po battery and BMS
- Simple hardware design with minimal components
Applications
- Ethical security and surveillance operations
- Remote monitoring in sensitive or high-risk areas
- Lawful intelligence gathering and threat detection
- Research and learning in long-range communication systems
This GSM-based spy device demonstrates how long-range surveillance can be achieved using minimal hardware and a compact design. Built around the IndusBoard Coin, it highlights the power of GSM communication for real-time remote monitoring, while emphasizing responsible and ethical usage in security-focused applications.