MillSO 6.35 mm Male to 3.5 mm Female Audio Adapter plugs and sockets snap in very well. Do not too loose or too tight so you can enjoy high-quality sound. The 6.35mm Male Adaptor is compatible with amplifiers, electric guitar/piano, stereo system, mixing console, home theater devices, or AV receivers with a 6.35mm stereo jack. The 3.5mm Female Stereo port is compatible with smartphones, MP3 players, Tablets, portable CD/DVD players, or laptops with standard 3.5mm 1/8 inch plugs.