06311-ZVL-050 Smart Key Unit Kit - Overview. The 06311-ZVL-050 Smart Key Unit Kit is a critical component engineered for Honda marine engine systems. This kit supports the smart key system, enabling keyless engine ignition and operation. It plays a vital role in modern Honda marine engines by enhancing convenience, security, and ease of use, allowing users to wirelessly start and control their marine engine.. Key Features. This unit kit includes the smart key control case and the associated hard