This is a review of the Arlo Pro system. Easy to install, easy to setup. Records audio. Can talk through each camera. Comes with Alarm button that sends a high pitched audio signal through the base. The cost of this system is a lot less than traditional hard wire camera systems. VERY USER FRIENDLY!!! I have had this system for 2.5 months now and I love it. Motion activated, looks great, and mobile device compatible. Downloads straight to your phone and runs on a cloud system. GREAT PRODUCT!