The PCI 4 Link Pro Elite Intercom comes with two 12' cables to plug your headsets or helmets into. The intercom features a voice activated microphone circuit (adjustable) that automatically mutes your music for conversation, has a common volume level adjustment and record out for video. Includes an iPhone/MP3 adapter so you can plug your existing music source right in, or a stereo line driver to connect your deck. This kit is geared for those who have existing helmets or headsets. Optional upgrades include Bluetooth wireless connectivity and DSP (Digital Signal Processing). Which when activated eliminates outside noise from transmitting through your intercom system.