Compatibility: Hikvision IP Video Doorphones ; Shield: 7 " - capacitive touch screen ; Resolution: 1024 x 600 ; Internal memory: 128 MB (built-in) ; Main features: Bidirectional communication, Automatically capture and save photos if there is no response to the bell button, ; Alarm inputs: 8 ; Power supply: 12 V DC, IEEE 802.3af ;