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Portable Dental X-ray Unit 70kv High Frequency X-ray Machine Dental Equipment. 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. The battery is durability, it can take about 500 images after full charged, and it can be charged and discharged for 1000 times in its life.