Nutone IK15 2-Station Door Answering Intercom w/Optional Door Release -Security and convenience for condos, townhouses, apartments, even offices -Economical, easy to install -Press the talk button to talk to the door; release to hear reply -Two-note chime sounds when caller presses pushbutton at door speaker -Inside speaker is Bright White, has volume control, automatic timeout for privacy. Inside speaker dimensions: 5-1/4"x7-3/4"x1-3/4". -Includes transformer (16v). -Door speaker operates hands free; includes nameplate. Brown. Door speaker dimensions: 4"x5-3/8"x1-7/8 -Optional second door speaker available (IS-68) -In some instances can use existing chime wiring. -DOOR RELEASE OPTION-allows you to push a button and enable the visitor to open the door -Optional door release button (PB-1CL) -Optional door release (DR-1 and DR-2) PLEASE NOTE THE SHIPPING AND RETURN POLICIES NEAR THE BOTTOM OF OUR HOME PAGE.