Optex IVP-DU BRAND NEW iVision+ Wireless Video Intercom Expansion Door Station This is the expansion door camera unit only View and talk to visitors from the safety and comfort of any location inside your home or business The iVision+ wireless intercom package includes a convenient wireless handheld unit with LCD monitor and a wireless doorbell/camera unit with over 330ft. transmission range, line of sight he iVision+ allows for multiple stations, making it a perfect fit to monitor up to two residential or commercial doors, from the comfort of up to four different locations.