... Intercom System Handheld Receiver Specifications: - Screen - 3.5 inch TFT LCD monitor - On Screen Indicators - Monitor State, Lock/Unlock, Talk, Take a ... Indicator, Mini USB Input, Speaker, Volume -/+, Brightness control -/+, Antenna, Power ON/OFF Switch - Dimensions: L:102 x W:134 x H ... - Call Button, 6 LED Lights. MIC, Speaker, LED Indicator, Power ON/OFF Switch - Dimensions: L:127 x W:95 x D ...