Help with Powertap identification
 

I'm looking at buying a Powertap with a yellow hub cover. It is advertised as a new wireless SL+. Based on the 2.4 head I am assuming it is actually an older model SL 2.4 which could be upgrated to support ANT+. My only concern is I haven't seen any recent models with a yellow hub cover. Can anyone identify the model shown below? I've asked the seller but he is selling for someone else and doesn't have all the details.


http://i37.tinypic.com/dvn3fn.jpg

http://autobus.cyclingnews.com/photo...d_powertap.jpg

from TdF 2008, VanDeVelde's rear disc.

No production model has a round yellow cap like that, but Saris did make some with yellow capped versions for Slipstream, for some rental units, and I believe samples for vendors. The SL+ and the 2.4+ (what Saris calls an ANT+ upgraded SL 2.4) look idential from the outside, so to tell the difference you need to take the freehub off. The axle on the SL+ is thicker and the freehub on the SL+ pops off without tools, while on the the 2.4+ you need to loosen a bolt to get it off.

Thanks!

Actually, before I missed that you mentioned the CPU. If the CPU says 2.4 just to the right of the screen, then it is a 2.4+. In 2009 they changed the CPUs and now they don't have the 2.4 printed there, so a SL+ would not have that. For 2009 all the CPUs use the 2.4 gHz frequency now so I guess they didn't think it was necessary to write it on the CPU.