Wireless Doorbell With Pir Motion Detector Sensor Alarm Chime For Visitors And. Introducing the New SF20, a Versatile and Smart Doorbell System Designed to Enhance Security and Convenience in Any Setting. With a Comprehensive Suite of Five Functions—welcome, Doorbell, Alarm, Lantern, and Night Light Reminder—this Device Ensures Both Hospitality and Protection. The SF20 Supports Up to 32 Wireless Accessories, Including Infrared Sensors, Magnetic Door Sensors, and Vibration Detectors, Allowing for a Fully Customized Security Setup. It Also Accommodates Up to 8 Controllers, Offering Flexibility and Multi-purpose Use. Equipped with Colorful LED Lights, the System Allows You to Differentiate Multiple Entrances Using Adjustable Brightness Levels. This Feature Enhances Visibility and Intelligence in Management. Perfect for a Variety of Locations Such As Shops, High-end Clubs, Hotels, Offices, Factories, Homes, and Villas, the SF20 Caters to Diverse Environments. Its Long-distance Transmission Capability Covers an Open Space of Up to 280 Meters, Making It Ideal for Larger Venues. The System Includes Special Speakers That Deliver an Independent Alarm at Up to 113dB, Effectively Deterring Potential Intruders. Designed with User-friendliness in Mind, the SF20 Offers Adjustable Volume and Convenient Features Like Battery Memory Retention, Ensuring a Comfortable User Experience. Features Summary: - Five Functions: Welcome, Doorbell, Alarm, Lantern, Night Light Reminder. - Supports 32 Wireless Accessories: Infrared Sensors, Magnetic and Vibration Detectors. - Accommodates 8 Controllers: Flexible, Multi-purpose Use. - Colorful LED Indicators: Adjustable Brightness for Multiple Entry Points. - Long-Distance Coverage: Up to 280 Meters in Open Space. - High Volume Alarm: Up to 113dB with Special Speakers for Upper Floors. - User-Friendly Design: Adjustable Volume and Battery Memory Retention. - Versatile Applications: Suitable for Shops, Clubs, Hotels, Offices, Homes, and More. Enhance Your Security with the New SF20's Smart and Adaptable Features for Peace of Mind and Efficient Management..