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 desired phone number for callback. The device features a built-in microphone with a range of up to 7 meters, allowing you to monitor surrounding audio from a distance. Key features: - Call the device to listen in remotely - Auto-dialing function activates when sound is detected - Tri-band GSM support (850MHz, 900MHz, 1800MHz, 1900MHz) - Built-in rechargeable 400 mAh Li-ion battery - Voice-activated mode offers 58 days of continuous operation - Compact design with dimensions of 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 laws and regulations regarding the use and ownership of audio monitoring devices in their respective countries. The seller assumes no liability for legal or customs issues arising from the purchase or use of this product.