This OBD2 smart key programmer is designed for 4D chip smart key fob programming, compatible with Toyota and Lexus vehicles. Connect directly to vehicle OBD port without complicated button operation. Adopts original key‑programming protocol, supports K‑line and CAN‑BUS communication. It supports adding extra smart keys with existing main key, as well as all‑keys‑lost initialization function. Programming one key only takes about 10‑20 seconds, and keeps the vehicle anti‑theft system intact. Important Reminder: This device is intended for legal professional auto‑repair only. Strictly follow official operation steps. Improper operation may cause system error. If LED keeps flashing after matching failure, please clear fault codes via anti‑theft diagnostic tool. Do not disassemble the programmer housing. Specifications ‑Material: ABS Plastic ‑Interface: OBD2 ‑Supported Chip: 4D Chip ‑Supported Protocol: K‑line, CAN‑BUS ‑Application: For Toyota & Lexus Smart Key Programming ‑Package Includes: 1 × OBD2 Smart Key Programmer