☆the best viewing distance of the cell phone stand screen amplifer is 1.5-2 meters(4.9-6.6 inch) ☆charging:1:charging with a 18650 battery(not included);2:charging with a usb charging cable. ☆hands-free:you just press the hands-free button to answer when your phone called in,after finished your calling,you can keep to use this screen magnifier to watch movies or videos ☆it is a good gift for