KnockLink is a self-calibrating, visual knock warning tool. The KnockLink is designed for tuning, street and race use. Will require a knock sensor to function (sold separately) or you can purchase the KnockLink Kit that includes the Knock Sensor and Loom. The G4 KnockLink is the only detonation warning device on the market that requires no setup. Other systems require time consuming gain, frequency and noise settings to be adjusted. Without proper knock listening tools, this can prove difficult if not impossible. The KnockLink requires none of this, just Wire-In and start the engine. Even light detonation will damage an engine over time. The G4 KnockLink's microprocessor continuously scans the knock signal and warns for any knock occurring. The engine's RPM and load is automatically 3D profiled by the KnockLink, continuously storing and dynamically adjusting this noise profile map while looking for the particular knock frequency.