Though we've previously spotted the new JiSS-585 ($130) up in Canada under the Centrios brand as Black Pearl Wireless Speakers, Jensen's version is promised to be available at a lower price and offer the same appeal: RF-based wireless speakers that can be picked up, carried around, and independently adjusted in volume level. The all-black unit is interrupted by silver only on the globe-shaped speakers that are otherwise reminiscent of Brookstone's…