Just bought their $21 wireless computer. Doesn't work. Tried new batteries, still doesn't work. It will show random speeds up to 40mph intermittently while sitting still, then 0 when the bike is moving. Of course I had to destroy the heavy duty packaging to get it open, so I can't take it back to the store.
Checked the manual and found a web address: http://www.bellbikestuff.com
It's a "coming soon" page that according to the Wayback Machine, has been there since at least March of 2010.
Now that's a serious lack of concern for the customer.