By using the Mercedes Benz multi-frequency smart key you can find out the Mercedes Benz remote receiver frequency if it is 315Mhz or 433Mhz by the
Mercedes FBS3 Smart Key With 3Buttons Adjustable Frequency 315MHz - 433MHz
Smart Display Key for various Mercedes-Benz models –
AKS KEYS New Smart Remote Key Replacement Uncut Blade Blank For Mercedes Benz (10 Pack)
Mercedes benz key fob not working - How to get car key to work again - Locksmith Lion Naples FL
Mercedes Key Fob Not Working? Here's What You Need To Do
BMW Display Key: Technology nobody asked for? - Autoblog
Can you reprogram a Mercedes-Benz key fob? - Quora
Car key Fob for Mercedes-Benz Smart 2005-2015 Fortwo Remote Fccid: KR55WK45144;by AUTO KEY MAX (PAIR) : Automotive
Mercedes-Benz FAQ
Mercedes-Benz Key Replacement