Often there is not enough USB ports on the computer. This hub allows you to have 4 ports from one. Can be powered by the supplied AC adapter when connecting to energy intensive devices (hard disks etc.), this box can be operated without external power which case it receives the current USB port of the computer. Please note all times this mode of operation: some USB drives consume much current, and connect more could lead to a deterioration thereof and data loss! It should be noted that the hub is USB 1 and 2 only. Indeed flows offered by the 3rd version of the USB standard are not compatible with existing hubs. The aesthetic is quite successful. The first port can be used to recharge a device (mobile phone, for example) without the computer being switched on provided nevertheless have connected the power supply. The cable is 95cm (depending on the manufacturer). Only regret: the ports are too close to each other which can prevent plugging some key a little "pot-bellied". I recommend this product.
