This twoway GSM audio device calls you when it detects sound in its vicinity. How amazing is that Just insert a GSM SIM card and program it to your desired callback number and youre good to go. Are you trying to find out the truth about whats being said behind your back Now you can do it remotely. You can even place multiple of these audio devices and set them up in your desired locations like the bedroom, living room, conference room or office. Just insert a SIM card into the audio device and your bug is active and ready for action. This twoway audio device comes with two great features 1 Call the audio device and you can immediately listen in on conversations. The builtin microphone works up to a radius of 7 meters, so set this bug up anywhere you want. 2 Allows the audio device to call you when it hears people talking. This feature makes it much more advanced than other GSM audio bugs on the market today. Hot spots Audio Gadget Auto Dialing option TriBand GSM Audio Device Product Notes When it detects sound, the bug will ring your cell phone You can charge the audio device by connecting the USB charging cable to the power charger This product is sold as an investigative tool for law enforcement or licensed investigators. Anyone else ordering this device should only order it as a simple toy as MANY COUNTRIES STRICTLY PROHIBIT THE OWNERSHIP OF DEVICES. Important Note You are solely responsible for finding out if this product is legal to import andor use in your country. We ship you the products you order and cannot accept any responsibility for customs issues or any consequences of your ownership or use of this device. Specifications Primary Function Triband GSM Twoway Audio Device Material Molded Plastic Color Black GSM Frequency Compatibility Triband 850MHz, 900MHz, 1800MHz, 1900MHz Microphone Range 57 meters radius Power Builtin 400mAh Rechargeable Liion Battery Turn on the voice control function and the epected continuous working time is 58 days Only the positioning function is epected to last for 1621 days Dimensions 4.3 3.2 1.4cm Package Includes 1 Listener 1 Charging Cable 1 Instructions