Roll diameter: 58 mm • extreme exquisite lightweight structure design is easy to carry • easy paper structure is easy to use and maintenance • equipped with large capacity rechargeable lithium battery 7.4V, 1500 Ma • 1.2 meters cement ground height of fall Multiple wired and wireless interfaces optional • support the client local program upgrade • equipped with Windows computer end drive • equipped with WM, WINCE, Symbian, presentation software and dynamic link library Android platform • Bluetooth host function