Their website explains it very well: Sunax English language website It just slides up between the inner and outer helmet shell. They suggest you use an old credit card first to ensure you have the room. It comes with a couple of attached friction pads that keep it from moving around. A review I read last week said he had trouble trying to get it in but I had no problem with it (a first for me!). 
Blue/White 2007 TBA, Thruxton needles, Unifilter, AI removed, Polaris Bellmouth, Bubs, Nology Coils/wires, Lightbar, Ricor Intiminators, Hagon Nitros, Tall Sissy Bar w/luggage rack, Dart flyscreen & Lowers. 130 Mains, TrueGel Battery MG12-BS.
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