Optical to 7pin input adapter For Sony DAT WALKMAN TCD-D3 D7 D8 D100 PCM-M1 3D printed product, the pins are brass with gold plating. The brass pins may be deformed when dropped on the ground, don't worry, they can be restored with tweezers This adapter is used for optical recording input, which is simple, compact and convenient. Most CD players have optical output, and ordinary optical fiber cables can be used. The adapter has a red working indicator light. The red light is on, and the input is normal.