... inch screen Color Hands-Free Digital Wireless Video Door Phone System Primary Function: Home or Office ... TFT LCD monitor - On Screen Indicators - Monitor State, Lock/Unlock, Talk, Take a Picture, Increase Volume, Decrease ... 250 meters (ideal conditions) - Onboard Buttons/Indicators - Unlock Door, View Monitor. Talk Button, MIC, LED Indicator, Mini USB ... 1 x Wiring of electric lock(Optional) 1 x User manual