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's learn mode. Compared to official GM tools source. Features - Color: Orange. - Material: ABS, Electronic Component. - Size: About 15X6X3cm/5.89X2.36X1.18inch. - Adoption of premium material, this product is durable, handy and long-time use. - Easy and fast operation, just press a button to activate a single sensor. - Accurate recording has its own learning to record function. - This tire pressure reset tool can help you reprogram all kinds of tires easily. - A nice and convenient tool to reset your car tire pressure.