A single charge lasts up to two months with wireless off based upon a half - hour of daily reading time. (amazon.co.uk)
One month with wireless off based upon a half - hour of daily reading time. (wiki.mobileread.com)
Have students practice recognizing this sound in daily reading, picking out objects in the room that have the sound in them and coming up with a list of words that contain the sound. (thoughtco.com)