Giro TuneUps Nine 9 This TuneUps trade Sound System fits the Giro Nine.9 Helmets. This is a second set of earpads featuring compact speakers with massive sound and an in line mute. They are connected to the player (not included) by a coiled cord with in line mute. The cord is detachable right at the earflaps. The TuneUps have a mini plug similar to the headphones you might plug into your MP3 player or walkman. Ultimately the cord length is about 37". Features: Speaker Dimensions 40mm 32ohm NdFeB speaker plus grill cover Frequency Response (in Hz): 20~20 KHz Sensitivity: 117 + 3dB at 1 KHz Note: These will not fit in the Nine helmet with velcro ear flaps (2000 2001) they ONLY fit the Nine.9. Note: TuneUps trade are for use with Giro snowsports helmets only.