For parents wanting to monitor multiple rooms or children, the DXR-8 add-on Camera Unit can be used with your existing Infant Optics DXR-8 baby monitor. Each DXR-8 monitor pairs up to 4 Camera Units. Viewing direction is remotely controlled both horizontally and vertically. Compatible with Infant Optics Optical Zoom Lens (sold separately) and Optical Wide Angle Lens (sold separately). Constructed with multi-layered glass lens pieces in aluminum housing for improved video performance. 100-240V compatible power adapter included Gender: unisex.