We thank Yokota for the article and Travis for his comment. Travis is correct that our initial SW-501 models in year 2006 didn't have on-off switch. However, since then we have been constantly upgrading our products. All of our current products have on-off switches, and now we also offer rechargeable battery options.
We are going to be at Interbike Expo in September, and our booth number is 6000. Travis, if you could bring SW-501 to the show, we will fit in a new amp-speaker system for you.