Mobile Phone SIM Card Sound Monitor Surveillance

This device allows you to hear 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 will work like a phone with a sensitive speaker. So you can actually hear what anyone's talking about you or whatever when you call in that sim card's phone number.

But no one will notice, because this device looks like a USB hub or small USB device.

1) The whole world does not have the distance sound monitor (uses GSM signaling Transmission, does not have the distance Limit).

2) Use Long time, may achieve for seven days.

3) Use the double headed design the sound ultra clear.

4) The Volume is smaller, more convenient hiding.