Not compatible with DXR-8 PRO (5.0" model) Additional Camera Unit pairs with Infant Optics DXR-8 (3.5" model) Features remote pan/tilt/zoom, night vision, remote thermometer, and interchangeable lens. Number of channels: 1 frequency channel Expand up to 4 camera units per monitor unit Zoom lens and wide angle lens sold separately. Camera unit power adapter included. Add-on Camera Unit for Infant Optics DXR-8 (3.5" model) video baby monitor. Not compatible with DXR-8 PRO (5.0" model). Pairs with Monitor Unit in seconds. Features remote pan/tilt/zoom and interchangeable optical lenses. Charger included. Zoom lens and wide angle lens sold separately.