Remote connection and wiretapping of the environment in stealth mode?

Question

Android

I ask you to advise an app for android, the task is this - there are two devices (both mine, if anything), you need to get access to listen to what is happening around (in real time) from one device to the second. Preferably without activating the screen on the device to which you connect ... Ie. I need to leave the handset in the room and connect to it to listen to the conversation of those people who will be next to the device ...

Answer 1

any application that turns a smartphone into a webcam - for example ip webcam , works on the local network without any problems, allows you to shoot audio-video, set up camera mode and in general a lot of useful things.
starting with version 6 or 7 android can work with the screen off