... 2. The power is Large and Energy-efficient 3.Positional accuracy is hig. Ultrasonic Drilling and Carving Machine Voltage:220VPower:2. ... overload, overcurrent, overvoltage, automatic protection 3, large power, efficient and save energy, no radiation, no pollution 5, suitable for processing ... jades, crystals, agates, glasses, hard alloys and all kinds of semi-precious stones ...