Tend Secure Pro 2 : You can get a 2 Pack for less than $90 on Amazon and they have built in mircophones and speaker (for talk back function). They come with free cloud storage too. You can have one for the display and the other on the sump. They’re hard to beat for the price. I like these probably a little better than my Arlo systems which I used up until recently, however these do require a plug.