... Digital Wireless Video Door Phone System Primary Function: Home or Office Audio and Video Portable Intercom System Handheld ... - Onboard Buttons/Indicators - Unlock Door, View Monitor. Talk Button, MIC, LED Indicator, Mini USB Input, Speaker, Volume -/+, Brightness control ... - Onboard Buttons/Indicators - Call Button, 6 LED Lights. MIC, Speaker, LED Indicator, Power ON/OFF Switch - Dimensions: L ...