Mercedes-Benz CLA 2020 Operator's Manual page 111

Open flap 3.
#
Insert the plug of the device into 115 V
#
socket 1.
When the on-board electrical system voltage
is sufficient, indicator lamp 2 lights up.
Using the 12 V socket in the trunk
Requirements:
Only connect devices up to a maximum of
R
180 W (15 A).
Lift up cap 1 of the socket and insert the
#
plug of the device.
Seats and stowing 109
USB port in the rear passenger compartment
% Depending on the vehicle equipment, the
design of the stowage compartment and the
number of USB ports in the rear passenger
compartment center console may vary.
If the ignition is switched on you can charge a
USB device, e.g. a mobile phone, at USB ports
1 using a suitable charging cable.