KB Portable E-FileKB E File is suitable for any nail tech to save you time and hand, wrist, shoulder and back strain. A powerful high torque yet almost silent, minimal vibration e file and will make your nail services a breeze. USB Powered Charge from mains, power bank, laptop or even car changer Stop, pause memory function Forward & Reverse Function Doubles as a power bank to charge your devices Acetone resistant hand piece and control box (external coating only) Fits