Netgear’s Arlo home security cameras are among the few that can run completely on battery power, and the newer Pro models add additional touches like rechargeable batteries (rather than watch batteries), improved motion detection, two-way intercom, and a base station with 100 decibel alarm. So if you’re ready to start monitoring your home like a paranoid person, Amazon will sell you the two camera starter kit for $375 today, an all-time low.