To deactivate and permanently activate the confirmation tone when locking the vehicle. For vehicles with an MBUX head unit, activation/deactivation is done via Settings > Vehicle (see product image). Activation and deactivation via your vehicle's diagnostic interface Simply connect the adapter to the vehicle's OBD interface - done! Once coding has been successful, the confirmation tone is permanently activated. The function can be deactivated at any time with the dongle on vehicles that are not equipped with an MBUX head unit. Example: 1st use = acknowledgement tone is activated 2nd use = acknowledgement tone is deactivated 3rd use = acknowledgement tone is activated 4. etc. Suitable for the following models: A-Class 177 series (only suitable for vehicles up to model year 2022) EQA-Class 243 series B-Class 247 series CLA-Class 118 series GLA-Class 247 series GLB-Class 247 series GLC-Class 253 series EQC-Class 293 series E-Class 213 series E-Class Coupé/Cabrio 238 series CLS-Class 257 series GLE V167 167 series GLE C167 167 series GLS V167 167 series other models on request Scope of delivery: 1x coding dongle