A:AnswerNo, these cameras are not audio enabled. All the cameras with this system are wired. We do have some new Bluetooth wired systems that are wi-fi expandable (and our wi-fi devices have 2-way audio). Please view the link below for one option. https://www.bestbuy.com/site/night-owl-8-channel-8-camera-indoor-outdoor-wired-1080p-hd-1tb-dvr-spotlight-cameras-white/6472240.p?skuId=6472240
A:AnswerIve had this system over a year with a 1T drive that i backup and store into files after i export them and i run my system continuously, id say before youd have to backup or clear would be a solid week of nonstop recording .