... (electric lock)Wireless connection among such three parts.Fetures:1. All digital and encryped technolgoy applied2 ... - Onboard Buttons/Indicators - Unlock Door, View Monitor. Talk Button, MIC, LED Indicator, Mini USB Input, Speaker, Volume -/+, ... -- Onboard Buttons/Indicators -Microphone, Call button , Speaker, USB interface for charge , Power switch , ‘Pairing’ button, Indicating light for low voltage ...