Infrared Sensor Doorbell with MP3 Audio Playback Enjoy a practical and versatile doorbell solution designed for convenience, easy setup, and alerts. This infrared sensor doorbell combines sensitivity with flexible sound options, making it ideal for home, office, or entrances. Key Features: Builtin 8Ω 1W speaker delivers clear, audible sound for reliable alerts. Integrated 32Mbit (4Mbyte) flash memory stores your choice of MP3 audio files. Supports two power options: three AAA batteries for wireless operation or USB power supply for continuous use. Infrared motion detection with human body sensing technology for accurate triggering. sensitivity with detection distance of up to 4 meters, ensuring timely alerts. Adjustable volume settings with two selectable levels to suit your environment. Two playback modes: full loop playback or single loop playback, tailored to your preference. Easy audio control with dedicated buttons: Press A to play the previous track, Press B to play the next track. Benefits and Applications: 1. Residential Use: Receive a friendly, audio alert when visitors approach your front door, even before they knock. 2. Retail or Commercial Use: Greet customers automatically when they enter your store, enhancing engagement and service. 3. Office or Workshop Use: Stay aware of people entering restricted areas or workspaces without relying on visual monitoring. Technical Specifications: Speaker: 8Ω 1W builtin Memory: 32Mbit (4Mbyte) flash for MP3 storage Power Supply: 3 x AAA batteries or USB connection Detection Distance: Up to 4 meters Playback Modes: Single loop or full loop Controls: Previous track (A), Next track (B) Volume: Two adjustable levels This infrared sensor doorbell offers an efficient way to stay informed when someone enters, with easy installation, audio, and dependable performance. Suitable for various environments, it provides both functionality and flexibility in one compact unit.