Choose from cable, microphone, speaker and other options to make your headset unique to your situation! The 2G kits are our 'basic' headsets, mount internally and have a single cable from helmet to bike and do not have a built in audio input jack for iPod and similar devices or for earbud speakers. The 3G kits are our 'advanced' headset and include a two-section upper and lower cable, external mount for low profile in the helmet, and our unique 3.5mm input/output jack that makes the 3G a "Swiss army knife" kind of headset. The prices shown are the basic essentials, and as you add and remove options the price will change automatically so you know what your out the door price is.