... * LED light source, clear night vision, 24 hours for monitoring * Call, intercom and unlock function * One to one, One to many ... Transceiver * Built-in Dipole Antenna * Built-in microphone and speaker * Bell Button to trigger Indoor Unit link * Lock open ability for ... ,RoHS,R&TTE Wireless video door phone, Wireless video door bell, Video door phone, Wireless door phone, wireless doorphone, wireless ...