1、Ultra Long Distance: This wireless door bell has long distance transmission, high strength signal, and sensitivity, with an open area transmission distance of up to 100 meters.2、Dual Way Intercom: This wireless door bell supports dual way intercom, allowing you to hear and answer the door bell in a timely manner without worrying about missing visitors.3、Pairing Operation: Pairing outdoor bell with indoor bell. By learning its code, an outdoor bell can be paired with multiple indoor bells without interfering with other devices.4、Power Supply: The outdoor door bell equipped with 1000mAh rechargeable lithium battery, with low power consumption and up to 6 months of standby, efficient and practical.5、Wide Applications: This wireless voice door bell kit is suitable for home, school, apartment, villa, office, warehouse, hotel, factory, hospital, etc., the adjustable speaker provides clear sound.