This Gsm listening device allow you to spy anyone in any place. You only need to buy a new SIM card, place it in this device. Once you call this number, this device will auto answer, and it is working like a phone with auto answer without speaker.
So you can actually hear anyone's talking about you or whatever when you call in that sim card's phone #. But no one will notice, because this device look like a USB hub or small USB device. But actually it is a spy tool.
If you store this beside a computer and put in to a usb it will keeps charging..
And you can call in anytime anywhere..or you can put in the car or other place and it will work 1 to 2 days it will need to charge again.