... 2. The power is Large and Energy-efficient 3.Positional accuracy is hig. Ultrasonic jewel carving machineVoltage:220VPower: 4800WWorking ... 1. suitable for processing jades, crystals, agates, glasses and all kinds of semi-precious stones 2,The maximum ... overload, overcurrent, overvoltage, automatic protection 4, large power, efficient and save energy, no radiation, no pollution 5, high positioning ...