Check the lock Ring: It can be used to check the lock ring. Antenna Tester: Car lock detection circuit. Car key lock chip antenna tester. Small Tip: If the light is on but the car cannot be started, it means there is a problem with the chip. Useful Detection Tool: It is an indispensable automatic lock detection tool. How to Use: Check the automatic . If the light is on, it means there is no problem with the lock if the light is off, it means there is a problem with the lock ring if the light is on but the car cannot be started, it means there is a problem with the chip. The inductive signal detection card that can check the lock ring problem. It is strong in quality and easy to use. Note: Installation guide not included, we strongly recommend you seek professional installation. Please check as much as possible to make sure the item is what you need. Tips:The picture is a high-resolution rendering. The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. Colour:Red Material:Plastic Package Contents: 5 x ECU Induction Signal Detection Card Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.