Product Introduction XTOOL M822 Mercedes-Benz All Keys Lost Communication Adapter is used for finishing and optimizing all key lost for multiple Mercedes-Benz modules. With XTOOL M822 Adapter, you can save as much as 65% of the calculation time on the process, or save you from plugging the key emulator in and out for hundreds of times. XTOOL M822 Adapter needs to be used with X100 PAD3+KC501 set or X100 MAX.