button to choose either the headphones or powered speakers. On / off button for the microphone. Connecting headset (headphone + microphone) on the front and top rear Speakers. 1.50m cable. Volume control knob by a good pre-emption on the side. Connecting for 'Handfree "(hands free). Connects easily to the computer to headphone output slots (green) and microphone (pink). Does not default to its function effectively enable to alternate audio transmission read towards EITHER speakers OR the helmet with volume at will and use at the same time, the microphone to the net or any other use. Only flat, it lacks a small leaflet, despite the intuitiveness of the unit, including the kit use "hands free". This added to a delivery a bit slow for my taste (more than 3 weeks), it costs him a star. 4 stars however without any regret, well deserved! Thank you
