This two-way GSM o 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 two main functions: (1) Call the device to listen in remotely—the built-in microphone captures sound within a 7-meter range. (2) The device can automatically call you when sound is detected, offering advanced functionality compared to standard o monitoring devices. Key features: - Auto-dialing capability when sound is detected - Tri-band GSM support - USB rechargeable via included charging cable Product notes: - This device is designed for lawful use by law enforcement or licensed professionals. - In many countries, possession of such devices is strictly regulated. - It is the buyer’s responsibility to verify the legality of importing and using this product in their country. - The seller assumes no liability for legal, customs, or usage issues arising from the purchase or operation of this device.