The KS-1 functions as a smart key emulator compatible with 40-bit Toyota, Lexus, and Scion systems. Initially, it reads and stores the vehicle's immobilizer data via an XtoolUSA key programming device, and subsequently writes it to the KS-1 to emulate a programmed master key. This emulated key enables ignition activation, facilitating vehicle startup and active diagnostics. Moreover, it streamlines the process by bypassing the 16-minute immobilizer reset when adding an extra car key.

Designed for use with all AAB, AEM, and ACX Toyota/Lexus/Scion smart keys, this device necessitates an internet connection and the presence of either KC100 or KC501.