... Door, View Monitor. Talk Button, MIC, LED Indicator, Mini USB Input, Speaker, Volume -/+, Brightness control -/+, Antenna, Power ON/ ... LED lights - Power Source - AC Adapter (100-240V) 50/60Hz - Transmitting Frequency - 2.4GHz - Wireless receiving range - approx. 250 meters ... The portable receiver charges with the adapter included or through a USB connection to your PC computer Transmitting unit ...