... Monitor State, Lock/Unlock, Talk, Take a Picture, Increase Volume, Decrease Volume, View Last Picture, View Next Picture, Signal Bar ... Monitor. Talk Button, MIC, LED Indicator, Mini USB Input, Speaker, Volume -/+, Brightness control -/+, Antenna, Power ON/OFF Switch , ... - 2.4GHz -- Onboard Buttons/Indicators -Microphone, Call button , Speaker, USB interface for charge , Power switch , ‘Pairing’ button, ...