1,Check the lock Ring: It can be used to check the lock ring. 2,Antenna Tester: Car lock detection circuit. Car key lock chip antenna tester. 3,Small Tip: If the light is on but the car cannot be started, it means there is a problem with the chip. 4,Useful Detection Tool: It is an indispensable automatic lock detection tool 5,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. Name: Auto Lock Check Ring For Car Ecu Induction Signal Detection The printing/appearance may vary from batch to batch, but it will not affect the use; the actual product may have color difference due to different light or display. Colour:Green Material:PCB Package Contents: 3 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.