Versatile Power Options: This doorbell supports both dry battery operation and can be connected to a 12V power source, ensuring flexibility in installation and use. Clear Audio Alert: Features a distinct "Ding-" sound that is loud and clear, making it perfect for both residential and commercial settings. Easy Installation: Designed for hassle-free setup, this doorbell can be easily installed without the need for professional help, making it a practical choice for DIY enthusiasts. Design: Built to last, it withstands everyday use, ensuring reliability and . Color:White Material:plastic Package Contents: 2 * 12V wired access control doorbells Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.