Technically the SMH-10B. Two buttons (the jog dial and on the back, and jog dial rotates)
The SMH-10R (3 buttons on the face - the two status lights seperate them)
Bit of a comparison here actually between the models:
http://www.webbikeworld.com/motorcyc...10r/review.htm
It's worth noting some units suit some helmets better than others. The R is more of a permanent but modular setup, as you easily can replace the battery. However, the Nolan N104 (which I use) has a plastic skirt around the bottom, which prevents the B pinch mount from working. I've have to stick a mount on instead, which wouldn't work for temporary installs. I have an R on my N104 permanently, and a B to put on other people's helmets for a few hours.
Most have to stick the R battery on the back of the helmet and you have some cables, however, the N104 has a battery compartment for the Ncom system, so it's perfect for the R and it's a very clean install. On the flipside, I have to take the whole helmet to charge the unit, whereas the B can come off the bracket and is less cumbersome to charge. Then again, some have broken B pins taking it off and on... which isn't a problem for the R as there are no pins...
If you're buying the jog dial SMH10B 2nd hand, make sure it has a USB port which means it's firmware can be upgraded (and charges via USB). The early releases are not USB, and the firmware can't be as easily upgraded).
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