The Singing Machine SML668G Instruction Manual page 7

Connections
Charging Instructions:
Connecting to AUX IN Jack:
AUX IN
Directions to change the light modes on your device:
u
1
2
USB socket
1
2
AUDIO OUTPUT
/ HEADPHONE JACK
To External Unit
There are 3 built-in light modes. Repeatedly
press
effects.
— E6 —
Connect the included USB cable to the
USB Type-C port on the back of the
device.
Plug the other end of the cable into a
DC5V 1A socket.
Use an appropriate cable (3.5mm
audio cable not included) to connect
an external device.
Refer to page E14 for instructions
on selecting and using the Aux In
function.
/ button to switch between lighting