Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Retractable but not portable

People looking for portability, like me - this unit is not small. At all. Also, the picture does not show enough detail - the end that plugs into the power brick is a 3-prong "Y"-type (the one that normally can be found on desktops). Most laptops, however have power "bricks" with an 8-shaped plug - so this cable will not fit.