This two way GSM audio deice calls you when it detects sounds around its icinity. How awesome is that? Simply insert a GSM SIM card and program it to your desired phone number for call back and now you're in the business! Trying to find out the truth about what's being said behind your back? Now you can from a distance. You can een place seeral of these audio deices and set them up at your desired locations like the bedroom, liing room, conference room or office. Just insert a SIM card into the audio deice and your bug is actie and ready for action!This two-way audio deice comes with two amazing functions:(1) Make a call to the audio deice and you can instantly listen in to conersations! The built-in microphone works up to a 7 meter radius, so set this bug up whereer you want!(2) Allows the audio deice to call you when it hears people talking! This feature makes it much more adanced than other GSM audio bugs on the market today.Hot spots:Audio GadgetAuto Dialing optionTri-Band GSM Audio DeiceProduct Notes When it detects sound, the bug will call your cell phoneYou can recharge the audio deice by connecting the USB charger cable to the power chargerThis product is being sold as an inestigatie tools for law enforcement or licensed inestigators. Anyone else ordering this deice should only be ordering it as a simple toy since MANY COUNTRIES STRICTLY PROHIBIT OWNERSHIP OF DEICES.Important Note: You are solely responsible for finding out whether this product is legal to import and/or use in your country. We will send you the products you order and cannot accept any liability for customs issues or any implications of your ownership or usage of this deice.Specifications:Primary Function: Tri-band GSM Two-Way Audio DeiceMaterials: Molded PlasticColor: BlackGSM Frequency Compatibility: Tri-band (850MHz,900MHz, 1800MHz, 1900MHz)Microphone Range: 5-7 meter radiusPower: Built In 400 mAh Rechargeable Li-ion BatteryTurn on the oice control function and the expected continuous working time is 5-8 daysOnly the positioning function is expected to last for 16-21 daysDimensions: 4.3x 3.2 x 1.4(cm)Package Included:1 * Listener1 * Charging cable1 * Instructions