1Intelligent Detection: The infrared sensor door bell utilizes infrared motion sensing technology to accurately detect individuals at the door, providing timely notifications to the store owner or residents.2Split Design: The door alert main unit and the alarm can be separated, allowing for flexible installation options to enhance the security effectiveness according to your needs.3Voice Broadcasting: The motion sensor alert utilizes household language broadcasting to provide friendly reminders of the visitor's identity or broadcast warning messages.4Multiple Music Selections: With a variety of built in melodies, the motion sensor door bell allows for free switching to better meet personal preferences and needs.5High Reliability: With precise detection and audio playback, the welcome door bell ensures timely alerts and clear voice broadcasting effects, guaranteeing effective and reliable performance.