This two-way GSM audio device allows you to remotely monitor environments by making and receiving calls. Simply insert a GSM SIM card and program it to your preferred phone number. Once set up, the device can be used in various locations such as living rooms, offices, or conference rooms. With a built-in microphone effective within a 5–7 meter radius, it enables clear audio transmission. Key features include: (1) Call the device anytime to listen in on surrounding conversations. (2) The device automatically calls you when sound is detected, offering real-time alerts. Highlights: - Discreet audio device design - Auto-dial function for instant notifications - Tri-band GSM support (850/900/1800/1900 MHz) - Built-in 400 mAh rechargeable lithium-ion battery - USB charging capability Specifications: - Primary Function: Tri-band GSM two-way audio communication - Material: Molded plastic - Color: Black - Microphone Range: Up to 7 meters - Battery Life: Up to 8 days in voice-activated mode; up to 21 days in standby mode - Dimensions: 4.3 x 3.2 x 1.4 cm Package Includes: 1 x Audio device 1 x Charging cable 1 x User manual Note: This product is intended for lawful use only. Users are responsible for complying with all applicable local, state, and national laws regarding surveillance and recording. The seller assumes no liability for illegal use, customs issues, or regulatory violations. This device should only be operated in accordance with privacy laws and authorized for legal monitoring purposes.