1) Can hear through walls, doors, and windows.
2) Use high-sensitivity detectors, so you can fully understand the voices of the room you are monitoring.
3) Record the conversations using the audio output.
2)High-definition stereo headphones.
After the device fully charged, plug in headphones, Put the device close to the wall surface and turn until you hear a clear sound. You can also connect a digital recorder into the headset jack and record conversations.
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