Wireless Motion Sensor Doorbell Chime Alarm For Store, Office, Home Entrance. Introducing the SF23 Indoor Passive Infrared Detector, a Versatile Solution Designed to Enhance Your Home or Business Environment with Ease and Peace of Mind. Whether You Need a Welcoming Doorbell, a Security Alarm, or Convenient Night Lighting, This Multi-functional Device is Your Go-to Choice. With an 8-chord High-definition Voice and a Selection of 6 Welcome Sounds As Well As 35 Doorbell Melodies, You Can Customize Your Auditory Notifications According to Your Preference. Choose Between Powering the Detector with 3 AAA Alkaline Batteries or a 5V Micro USB Power Source (not Included), Reducing the Hassle of Frequent Battery Changes. Key Features: - Multi-Mode Functionality: - Welcome/Doorbell Mode: Automatically Greets Customers During the Day, Enhancing Store Ambiance and Alerting Staff. - Alarm Mode: Provides a Theft Deterrent at Night with a 30-second Alarm Sound when Triggered. - Night Light Mode: Lights Up with a Blue Hue for 2 Minutes Upon Detection, Ideal for Safe Nighttime Movement. - User-Friendly Operation: - Simple Power Up by Inserting Batteries or Connecting Via USB. - Easily Switch Modes Using the [M] Button for Quick Customization. - Installation Tips: - Recommended for Ceiling or Side Wall Mounting at Entry Points Using Screws for Stability. - Avoid Areas Exposed to Sunlight or Rain for Optimal Sensor Performance. - - Sensing Range: 2-8 Meters - Sensing Angle: 100° Horizontal, 15° Vertical - Volume Control: Adjustable Up to 98dB with 4 Levels - Environment Compatibility: Works in Temperatures from -10℃ to +33℃, Humidity <80% Enhance Security and Convenience with the SF23 Infrared Detector, an Excellent Choice for Homes, Offices, Shops, Hotels, and More..