Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Some should understand what they are buying

I have read some of the reviews of people saying that this cable does not fit their printer - of course not. It is an 'Extension Cable' (A to A) - the end of the USB cable that fits into devices is the 'B' end - this cable is strictly an extension of an existing cable. Also for those looking to extend the reach of their USB devices - USB standards are very specific as to how long a cable can be from device to hub. According to USB.org, the maximum length of a full-speed device cord is 5m (full power devices have a cord that can detach at both ends) and for low-speed is 3m (low-power devices are permenantly attached at one end - like a mouse). I hope this helps some consumers clear up the confusion.