This two-way GSM audio device alerts you when it detects sounds in its vicinity. Simply insert a GSM SIM card and program it to your preferred phone number to receive notifications. The device features a built-in microphone with up to a 7-meter detection range, allowing you to monitor surrounding audio remotely. It supports two primary functions: (1) Call the device to listen in real time to ongoing conversations, and (2) Enable automatic call alerts when sound is detected, offering advanced functionality compared to standard audio monitoring devices.Key features: - Auto-dialing alert function - Tri-band GSM compatibility - USB rechargeable design Product notes: - Designed for legal use by law enforcement or licensed professionals - Intended for lawful purposes only - Not suitable for illegal surveillance or unauthorized recording - Users are responsible for complying with all applicable laws regarding import, possession, and use of this device - Check local regulations before purchasing or operating this product This device is not intended for use in violation of any federal, state, or international privacy or communication laws.