... operated for both the outdoor camera and indoor monitor Upgrade CS335L wireless Peephole Viewer2.4GHz digital wireless ... very clear image and audio Indoor Monitor Specifications: - Screen - 3.5 inch TFT LCD monitor- On Screen Indicators - Monitor State, Lock/Unlock, ... (ideal conditions) - Onboard Buttons/Indicators - Unlock Door, View Monitor. Talk Button, MIC, LED Indicator, Mini USB Input, Speaker, ...