<p>➀ A compact GSM-based spy device is introduced that can monitor conversations over long distances, even internationally.</p><p>➁ The device is designed to be easily concealed due to its small size and can transmit audio when a specific phone number is dialed.</p><p>➂ The project requires components such as an IndusBoard Coin, SIM800L GSM module, Li-Po battery, and microphone module, along with specific code to manage the device's functionality.</p>