Our camera does not record sound and it does not have a microphone.
Amazon doesn’t allow to sell such items with sound recording.
We and all sellers have to follow these new rules, that’s why all cameras like this do not have a microphone.
If you see a black screen on the video:
Install the VLC player and open a video file in this player.
Use the 32Gb SD card for Mac
If your Mac doesn’t recognize the SD card