A:AnswerHi. Yes they have 2 way audio communication but it's not the greatest. It records audio excellent but if you want to communicate live with somebody, the sound is very low.
A:AnswerIt's not a recording light but infrared lights. At night you can see them. If you don't want the lights at night, you have to turn off the night mode feature. But it's not that bad.
A:Answerbase plugs into outlet obviously
cameras can go either way- plug or not plug (works on the rechargeable battery that last for months depending on usage)
A:AnswerArlo offers a variety of mounting options available here : https://www.arlo.com/en-us/products/accessories.aspx. To learn the recommended position of the camera, please check this article : https://kb.arlo.com/00005146. ^RM