TPMS Sensors for the Mercedes Benz S-Class come in two frequencies: 315MHz and 433MHz. Frequencies and compatibility vary depending on what region the S-Class was purchased from. The 315MHz sensor is compatible with North-America spec S-class models and the 433MHz sensor is compatible with European/Asia spec S-Class models.
Beru Huf RDE004 000 822 34 06 315MHz (North America Spec)
Beru Huf RDE001 000 822 3306 433MHz (Euro/Asia Spec)
The same applies to the 2007-2009 Mercedes Benz S-Class models
Siemens 002 540 7917 315MHz
Siemens 002 540 8017 433MHz