Simple Steps: Tire Valve Activator all tires much easier with just 3 steps: step 1 - activate the lean mode; step 2 - read tire pressure sensor information; step 3 - same method to read other tire pressure information. Notes for use: Before using this tire pressure monitoring system learn, make sure your vehicle is in TPMS learn mode. hold the tool against the sidewall of the tire near the valve core. press the button while holding the tool against the tire sidewall until you hear a horn beep from the car Easy Activation: The tool for activating the tire pressure monitoring system is simple, fast and user-friendly and activates the individual tpm sensor with one touch. Caution: Different vehicles may require different times to finish resetting all tire sensors. a 9v battery (not included) is required for the training device. when not in use, remove the battery.