1. The device is DC high frequency portable dental x ray unit, small, light and nearly no radiation. 2. There are manual buttons installed on the surface of shell, operate easily. All of the components are installed in the certral PC board, insulation bacuum and sealed stereotype protection make its brilliant features. 3. The unit mainly suitable for oral pre-treatment diagmosis of internal organization structure and root depth and so on. Is indispensable in daily life clinic, especially for dental implant surgery. 4. The battery is durability, it can take about five hundred images after full charged, and it can be charged and discharged for one thousand times in its life. 5. It can be connected with intra-oral digital x ray imaging system.