Note: When replacing the grinding head, the machine must be turned off, not on operation! The grinding head is not locked state, the handle will not turn!_x000D_Tips: _x000D_1. Switch the steering, first set the speed to 0, the machine needs 2 seconds to buffer when switching._x000D_2. Please use the original charger of the machine to avoid bsurning the movement._x000D_3. Do not use the polisher while charging, to avoid burning the movement._x000D_4. When charging the power of the first frame shows red, full turn yellow, about 3 hours to full. specification: Item Type: Electric Nail Grinding Machine_x000D_Material: ABS_x000D_Product Color: White_x000D_Battery Type: Lithium ion battery (shipped with built in battery)_x000D_Battery Capacity: 2500mAh_x000D_Product Voltage: 100-240V_x000D_Adjustable Speed: 0-35000rpm_x000D__x000D__x000D_Instructions for Machine Use: _x000D_1. Plug the polishing pen into the DC output socket on the main control machine. _x000D_2. When there is no electricity, plug the main control into the appropriate power outlet._x000D_3. Insert the drill bit directly into the sanding pen chuck. _x000D_4. Select the direction of rotation. _x000D_5. Adjust the speed you need by sliding the speed control knob. Instructions for changing the drill bit operation. _x000D_1. To remove the drill, turn the chuck handle in the "R" direction until it stops with a click and pull out the drill. _x000D_2. To install a new bit, make sure the chuck is in the open position, insert the new bit into the chuck and turn the chuck handle to the "S" direction until it clicks to a stop. Features: 1FULL FEATURED: One twist, easy to replace the sanding head, the newbie also easy to operate the sanding machine, simple operation full function. 2PORTABLE AND ADJUSTABLE: Portable, enhance the lasting life, simple operation, easy to understand at a glance, easy to adjust the rotation, adjustable direction, can be adjusted according to own use habits. 3HIGH SPEED: This electric nail polisher has a high speed 35000RPM, LCD display speed, powerful and efficient for you to polish your nails. 4LOW NOISE: Brushless handle, using brushless motor, strong power, low noise does not shock the hand, silent, low vibration, smooth and not hot. 5LONG LASTING: Charging time is 3 hours, working time lasts 10 hours, long lasting life, no need to charge frequently. PackageList: 1 x Host 1 x Grinding Pen 6 x Grinding Head 6 x Sanding Ring 1 x Storage Box 1 x Pen Holder 1 x Instruction Manual 1 x Adapter