No, you can not record to local USB on Arlo!
I would check to make sure the terminal on the batteries are making contact and see if the app connect. If not return it!
I disagree the battery last about a good 2 months, and that’s the name brand batteries.
On your app for Arlo it shows a battery and also the percentage that is left in that battery. that way you will know when your batteries are low!
Yes to everything except the two way audio. You need the Arlo Q for two way audio.
Each camera takes 4 CR batteries at $11 for a pack of 2!! They only last about a month in the cameras as well!
Yes, you can view from a smartphone.
WiFi is necessary for the Hub and Cameras. The Hub must be plugged into a Router which can either be a Router-Gateway and include the Modem, or the Router will connect to the Modem.
That is not necessary Installation is extremely simple.