Features: Fine workmanship and superier material, provides skin-friendly hand feel. High clear LCD display, shows electric quantity, rotation direction, rotation rate clearly. 6 standard grinding bits, easy to change without the tools. Built-in large capacity lithium batterys, supports 12 hours using time. Overcharge protection, overcurrent protection, reset protection, overdischarge protection, overpower protection, reverse powers protection, short circuit protection, overvoltage protection, temperature protection. Small size and light weight, convenient to carry anywhere. A must-have nail tool for nail salon use and home use.