Designed for studio monitor headphones with dual 3.5 mm connectors, Compatible with most over-ear headphones featuring dual 3.5 mm jacks, the FAAEAL cable offers 6 plug options ( 2.5 mm 4.9 ft // 3.5 mm 4.9 ft // 3.5 mm with mic 4.9 ft // 4.4 mm 4.9 ft // 6.35 mm 6.5 ft // 4PIN-XLR 6.5 ft) to connect with various music players, Smartphones, PC, DACs, and headphone amps.