Motion-Activated Doorbell: Infrared sensor detects movement up to 110° horizontal, 60° vertical; alerts you to visitors or activity at entryways, driveways, or hallways Wireless Home Security Alarm: Operates in voice, music, or alarm mode; suitable for homes, offices, or shops needing instant notification without wiring or installation Customizable Sound Settings: Choose from 32 built-in chimes; adjust volume across 4 levels (85dB±5dB) for clear audio suited to indoor or outdoor environments Battery-Powered Design: Compact plastic housing (5×8cm / 2.0×3.1in); powered by 3 AAA batteries (not included), suitable for flexible placement indoors or covered outdoor areas Versatile Usage Scenarios: Works in apartments, houses, factories, and commercial spaces; functions as a guest welcome system or perimeter alert with reliable wireless signal Multiple Operating Modes: Three distinct modes including voice mode, music mode, and alarm mode allow you to welcome guests with beautiful songs or human voice automatically Easy Installation and Setup: No wiring required for installation; simple button controls for music selection and volume adjustment make setup quick and convenient, Weight: 0.21825763938 pounds, Manufacturer: Zerodis