TechniSat DIGITRADIO 451 CD IR Instruction Manual page 70

Rear view
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Telescopic antenna Extend fully for optimal reception.
Headphone socket To connect external headphones with a 3.5 mm jack (stereo).
AUX IN Analogue (Line IN 3.5 mm jack stereo) to play external audio sources.
DC IN 12 V Mains socket.
USB socket 5 V, 1 A.