This 3.5mm Jack to Twin Mono 1/4" Jack lead is the ideal cable for any musician or DJ, with heavy-duty cable and connector construction and full signal shielding, great for stage, studio, or home use. The ProSound Twin 1/4" 6.35mm 2-Pole Jack Plugs to Single 3.5mm 3-Pole Jack Plug Cable is commonly used to connect from a headphone jack on a smartphone or MP3 player to amplifiers, mixers or even Active speakers.