D10 Intelligent 433MHz Wireless Doorbell Home Welcome Doorbell 250m Remote Door Chime,EU Plug - White Enhanced Security and Convenience: This wireless doorbell operates on a 433MHz frequency,offering reliable and secure communication. With a range of up to 250 meters Built-in dual speakers: Ideal for use in homes,offices,factories,and stores. The dual speakers ensure clear sound,making it perfect for welcoming guests or enhancing security Customizable Alerts: Choose from 36 different ringtones to personalize your doorbell chime. Adjust the volume with three levels - high,medium,and low - using the dedicated volume control button on the receiver Eco-Friendly Design: Built with a commitment to environmental safety,this doorbell is mercury,lead,and UV-free,ensuring zero pollution and contributing to a greener planet Easy Installation: The transmitter should be mounted at a height of approximately 1.5 meters for optimal performance. Simply plug the receiver into a power outlet to get started. No complicated wiring or setup required Specifications: Material: ABS Working distance: up to 250 meters Receiver size: 75*45*25mm Transmitter size: 76*45*25mm Receiver working voltage: 110-240V Transmitter working voltage: 12V 23A battery * 2 (included) Receiver buttons: 1) Music: 36 ringtones are optional,and the music logo button on the side is used for adjustment 2) Volume: Three-level volume adjustment (high,medium,low),and the volume logo button on the side is used for adjustment 3) Can be set to sound and silent (sound: sound + indicator light Silent: indicator light) Package included: 1 x Doorbell Receiver 1 x Doorbell Transmitter 1 x Double-sided Tape 1 x English User Manual