Available with a wide range of car key programmer if lost your car key; also with some car key copier if you want to make a copy of a car key with the old key. Supplying key programming tool that works with dozens of cars made, also owing some purposely-designed car key maker for BMW and Mercedes Benz and Transponder Key Programmer. Highly recommend key programmer like Autel MaxiIM Series All-In-One Key Programmer, Launch IMMO Tablet, OBDSTAR X300 DP Plus, Lonsdor K518ISE, Xhorse VVDI2 CGDI BMW, CGDI MB etc.