Mercedes-Benz S-Class 2019 Operator's Manual page 140

138 Seats and stowing
Vehicles with individual rear seats
Open flap 3.
#
Insert the plug of the device into 115 V
#
socket 2.
When the on-board electrical system voltage
is sufficient, indicator lamp
Using the 12 V socket in the trunk
Requirements:
Only connect devices up to a maximum of
R
180 watts (15 A).
Lift up socket cap 1.
#
1 lights up.
Insert the plug of the device.
#
USB port in the rear passenger compartment
Vehicles with a rear bench seat or electrically
adjustable outer seats