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 lock loop. 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. Specification: Product name: Auto Lock Inspection Loop Color: Green Material: PP Length: 10cm Type: test card Package Includes: 1 Auto Lock Inspection Loop