6. Crescent shape digital display screen. 7. Full-weather design, un-affected by wind, ice, snow & rain. 8. All kinds of sensor colors and styles are available. 9. High quality and easy to install. 10. Sensor Diameter: Front side:25mm, back side: 21mm 11. Sensor Color: Black 12. Sensor Q'ty: 4pcs(4 Rear)