Doorbell Wireless Home Battery Model All Use Battery Non Plug In Wireless Doorbell One Drag No Plug In Features: Wireless design, convenient to use, not limited by power supply, allowing you to get of plug problems and install easily. Powered by batteries, it saves time and effort, and there is no need to worry about power outages. It can respond to visitors at any time and ensure family . One drag plug free, and convenient, without the need for complicated installation procedures, plug and play, making you worry free and effortless. Multiple music options and personalized customization allow you to enjoy different music pleasures and enhance the home . and material, suitable for various environments, not afraid of humid weather, ensuring long-term use, it is the choice for home doorbells. Product Description: Product Name: Digital Wireless Doorbell Volume: 4th level volume Music: 38 ringtone music Receiver power supply: powered by a 3xAAA battery or USB power cord Emitter: 1x12V/23A battery Package list: 1x transmitter, 1x receiver, 1x USB cable Note: Due to manual measurement, please allow for slight errors. Thank you for your understanding.