... install wireless video doorphone,video intercom phone,video doorbell,intercom/unlock/monitor functions,clear image & sound,easy install Specifications:3.5" ... nobody answers the call;Built-in 16 doorbell chimes for option;Intercom Function,clear talk quality;Calling out, ... Surveillance,Automatically Unlock and Doorbell,etc functions;Camera Resolution:320*240 pixels;Power Supply: DC 12V,5A ...