Goliton? Motorcycle Helmet Headset MP3 Headphones Motorcycle Riding Equipment Product name:Motorcycle Helmet Headset/MP3 Dedicated Helmet Headset/GPS Navigation Helmet Headset. Product size: headphone thickness 0.9CM,diameter 5.39cm. Plug: 3.5mm. Earphone length and width:60 x 10mm. Suitable for motorcycle riders to listen to MP3 music, sound great, with remote control to adjust the volume, very practical.