Rated 2 out of 5 stars
MISLEADING add-on, because LCD screens are BACKLIT ALL THE TIME! Saves a bit of energy if U use a CRT tho' :) Or Plasma - but most people these days use LCD, so this add-on is actually WASTING the MAXIMUM energy, because 2 create BLACK on LCD uses the MOST energy, not the least.
If U wanna' reduce power consumption on an LCD, read with the backlighting turned way down, and with BLACK text against that white background (it lights the entire background regardless of what U C - LCD is SUBTRACTIVE, not addative, like CRT or plasma.
Get it straight ~:)