This item is tire pressure sensor. Widely used to reset car tire pressure. What you need to do is holding the tool NEXT TO THE TIRE SIDEWALL near the stem while pressing the button and in the vehicle& 39;s TPS learn mode. Compared to official GM tools source. Feature - Color: Orange - Material: Plastic - Size: 16.3x6.3x4.2cm/6.4x2.5x1.7inch - TPMS tire pressure sensor on models after 2012 can be read, only with some specified diagnostic tools. - This tire pressure reset tool can help you reprogram all kinds of tires easily. - Make sure that the vehicle is in the TPMS Learn Mode when you are going to test the device. - Easy to use, activates the individual TPM sensor with the press of one button. - Note: Please check your car model and make sure whether it can work with EL-50448 before placing an order.