Magnetic base: 1.Products Compatible: CW-073, CW-086, CW-087, CW-639 2.Product size: D82mm (diameter) x 8mm (thickness) Magnetic base for camera: Product size: D82mm (diameter) × 8mm (thickness)Installation: Fix the magnetic base to the U-support bracket of camera and attach the camera to the vehicle.Products Compatible: CW-073, CW-086, CW-087, CW-639Testing Standard: The 4.1.2.4 term of ISO16750 ...