The SELECT button is something you won't regret getting on the 850!

Some rumours have the 850 with the narrow band RF emitter, but I haven't been able to substantiate that.

Look to the main retailers on this site for buying or an authorized custom installer/dealer and ask them if they know if the newer ones have the narrow band RF.

If they do, it's a no brainer.

Even if they don't, you'll love the SELECT button difference!