... mAh Rechargeable Li-ion) - Receiving Frequency - 2.4GHz - Wireless transmitting range - approx. 250 meters (ideal conditions) - 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: ...