Originally Posted by
Dunbar
My Cateye Strada double wireless flashes to let you know which battery is low (head unit or wireless sensor.) It keeps working for maybe 2-3 hours after you get the low battery indication so you can replace it when you get home.
Wired is better if you don't mind the aesthetics of the wires. On my new carbon road bike I went with wireless due to ther superior (IMO) aesthetics.
I had a Cateye Wireless, a Cateye Wireless II, and a VDO (can't remember the model) wireless and neither warned me of impending battery doom in the sending unit...it would have been nice though! So I just carried a spare button battery in my seat bag. I haven't hooked up the new VDO Z2 I got just a couple of weeks ago since the new bike isn't here yet, so not sure if it has a warning or not, I don't see it in the instructions which makes me believe it doesn't.