Key features of the scf900 35 high definition screen on parent unit digital sound full encryption for maximum privacy multi channel can take up to 4 cameras mains or battery operation a battery pack and charger for parent unit baby unit requires aa batteries 3 lullabies 2 way communication talk back night light operates manually or auto and can be sound acivated vox you can select continuous or auto monitoring manual or auto nightlight the switel scf900 video digital baby