Bullet Points: 1Check the lock Ring: It can be used to check the lock ring. 2Antenna Tester: Car lock detection circuit. Car key lock chip antenna tester. 3Small Tip: If the light is on but the car cannot be started, it means there is a problem with the chip. 4Useful Detection Tool: It is an indispensable automatic lock detection tool 5How 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. Description: Theinductivesignaldetectioncardthatcancheckthelockringproblem.Itisstronginqualityandeasytouse. Specification: Name:AutoLockCheckRingForCarEcuInductionSignalDetection Material:ABS Color:red,green Size: about14*10*1.2cm/5.51*3.94*0.47in PackingList: ECUInductionSignalDetectionCard*1 Note: Duetothelightingeffectsandshootingangles,thereiscolordifferenceintheproduct,pleaseunderstand. Duetomanualmeasurement,thereisatoleranceintheproductsize.