The ZN066 is a tool devised to work in Subaru H-type bladed (mechanical) keys for Subaru vehicles where all keys are lost. The device is perfect for customers who do not have PROTAG, as it connects directly to the AVDI to emulate a master key for Subaru vehicles. It operates in a manner similar to the Toyota ZN039 2. However, due to the specifics of Subaru immobilizers, it was developed independently to assist with key programming situations. The ZN066 can only be used to enter the vehicle, in key programming mode, and cannot be used as a key.