ALEKO Wireless Video Door Phone System Display Intercom LM163 3.5" Display Unlock electric lock remotely; Clear night-viewing; 2.4GHz launch frequency Telecontrol distance is up to 500 feet, 24 hour monitoring, calling, speaking and unlocking door 300,000 pixel camera; The picture of the visitor will be saved automatically High quality indoor unit with 3.5" digital color display screen The monitor can take/save/view more than 200 pcs of photos automatically