U-Snoop is needed on certain vehicles to detect data directly from the car immobilizer unit. The cloning unit will automatically tell you if the U-Snoop is needed once it reads the original key. U-Snoop can substitute the Snoop and M-Snoop devices, used in the Ilco ID46 and Ilco ID48 Solutions respectively. U-Snoop is an accessory for cloning devices ILCO RW4 Plus and EZ®-Clone Plus