Harley Benton CG-15 User Manual page 24

Components and functions
1 [INPUT]
1/4" TS phone socket for the input signal from your instrument.
2 [HEADPHONE]
1/4" phone socket for headphones. If you connect headphones, the internal speaker is disconnected.
To avoid annoying noise, turn the volume control 'LEVEL' (5) down before plugging headphones in or out.
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guitar combo