MOTION SENSOR DOORBELL - Equipped with a smart chip for an impressive inductive range of 4-6 meters. This doorbell supports battery operation (dry battery not included) or USB charging, with a single charge lasting between 3-5 months. VOLUME ADJUSTMENT - Features adjustable volume settings with three levels: weak, medium, and strong, ensuring your notifications can be customized to your preference. Choose from a variety of pleasant ringtones to suit your style. PERSONALIZED VOICE RECORDING - Enables global voice recording and broadcasting. Simply long-press to activate recording mode and capture a specific voice message that is uniquely yours. WIDE APPLICATION - Ideal for various settings including homes, apartments, shops, and supermarkets. Perfect for assisting the elderly, sick individuals, or pregnant women, enhancing the safety and accessibility of their spaces. Use Scenarios: 1. In a busy household, easily hear when guests arrive with adjustable volume settings. 2. For elderly family members, use customized voice messages to call their attention, ensuring they never miss an important visitor. 3. In retail environments, use the motion sensor feature to alert staff to customer entry, improving service efficiency. With its practical functions and user-friendly design, this motion sensor doorbell is a smart addition to any home or business.