i got mine from a dirt bike store was not hd and had to buy batteries, the second one was a hd with usb cord and rechargable li-ion bat get this one. the naked looks like a basic kit, the helmet hero is my first and can be mounted on head or hat but a hd motorsports might suit you better. you can always get extras. the guy i got the second one from got it from a computer store. ill try and find an invoice with a adress