ITEM NAME:2 In 1 Durable Tire Pressure Monitor Sensor Home Activation Relearning for Ford Features: Compatible Brand: Compatible with for GM series and for Ford series vehicles. Replacement Parts: Replacing tire pressure sensors, tire pressure alarms or tire replacements. Notice: When using, please make sure antenna in correct position and the 9V battery(Not Included) in good.After all sensors reset, the car horns twice, the TPMS re-learn finished. Horn will ring twice and the TPMS indicator flashes, then the learning mode has been successfully entered. the antenna of the dedicated tool for tire pressure monitoring is facing upwards against the tire sidewall near the rim of the valve stem to start the antenna.