Description: 4.4 mm M to 3.5 mm F convert adapter lets your 4.4mm output devices work with 3.5mm NOT ONLY balanced BUT ALSO the stereo headphones, earphones. All adapters can only used with portable players , do not use in high-power AMP. Material: Copper, Precision machining, Strengthening protection layer. Product Dimensions: 1.81 X 0.24 inches (4.6 X 0.6 cm). Package Contents: 4.4 mm Male to 3.5 mm Female Headphone Audio Adapter. Specification: Material: Alloy+Plastic Length:200mm Package Includes: 1 Piece 4.4mm Male To 3.5mm Female Converter Cable