Audio cable (3.5mm stereo jack to 3.5mm stereo jack)  for use with your Harman Kardon Go + Play portable speaker docking station. 

Directly connect iPhones, smartphones, mp3 players etc. with a 3.5mm headphone socket to your Go + Play Speaker Dock via the Aux input on the rear of the speaker. 

Note: For iPhone 7, 8, 10, X  etc without headphone socket, use the Apple Lightning to 3.5mm socket adapter included with iPhone.