10 - White Plastic Base, Clear Glass, 12 Volt, 1.2 Watt, Instruments, Switches and HVAC Control Illumination Bulbs.
This bulb is 5mm in diameter and 20mm tall with a white plastic base.
The main usage is for the Heater and A/C Climate Control display illumination on later Mercedes models.
This was also used in the headlight switch, dash gauges, switches and other uses.
There are 2 other alternative bulbs with 1.2 wattage, see the illustration, however this is the recommended one from Mercedes-Benz, for this application.
This bulb can be used in all applications the other 2 - 1.2W bulbs were used in.