Buy Mercedes Start/Stop button – https://amzn.to/2tdUajx
DETAILED INSTRUCTION. How to install this Strat/Stop Button – https://www.youtube.com/watch?v=lGh2fRPDd90
Your car key should have a red panic button and the car by itself should be manufactured in 2010+ in order to be able to install that device.
An easy way to replace your key and start to use a start and stop button.