PIR motion sensor+ motion detection, push alarm to mobile via APP, more safe and accurate.Support 2-way audio communication, answer your door wherever you are. HD 720P image quality, support night vision, camera view angle covers 166°.Support WiFi connection, Android IOS APP remote control. Support visual intercom, IR night view, TF card record. Support up to 32G TF card storage(not included). With wireless doorbell chime, working range 1000ft/300m in open area, providing loud music chime. Support two power modes optional: battery or USB cable, (Both not included) very convenient.