... ο Built-in lithium battery with high capacity for over 8 hours of operating life ο Visible fault locating (VFL) ... .00001steps)Distance unitkm,m,kft,ftDisplay640×480, 6.5 inch TFT-LCD (touch screen)InterfaceUSB, Min-USB, Ethernet, earphone, SDOptical ... 19V±2V(2A) Built-in Lithium battery: 4400mAh, operating time ≥8 hours 2LanguageUser selectable: simplified Chinese, English, Russian, Korean etc.. ...