100% Brand new and high quality Features: Outdoor Wired Doorbell for Security Access Control. Equipped with a soft, loud and clear ding dong bell sound. Connect to DC 12V power supply directly. Can be used for a long time. Easy to install, wall mounted. The switch is not included. A good replacement for your old and broken one. Doorbell Wiring Steps: The positive 12V of the red wire is connected to the positive poles of the power supply The black wire GND is connected to the power supply GND The yellow wire and the green wire of the doorbell are respectively connected to the BELL+, BELL- The yellow wire and the green wire are not divided into positive and negative poles. Specification: Material: plastic Color: white Source voltage: 220V Power consumption: 12 (W) Working voltage: DC12V Red to 12V (+), black to GND (-) Working temperature: -10~80 degrees Item size: 67x25x85mm /2.64x0.98x3.35in Package Included:1 pcs xWired Doorbell (other accessories demo in the picture is not included.) Notes:Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you did. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!