washer cleaning principle: Using 50,000 Hz high-frequency vibration liquid to generate cavitation effect, forming tiny bubbles in the liquid and bursting, the shock wave causes the stain to be separated, emulsified and peeled off, thus achieving deep cleaning Product Name: Mini Washing Machine Condition: 100% brand new Material: ABS Specifications: Lithium Battery:2200mAh Material:plastic and metal Product size: 36*150mm Vibration frequency: 51K Hz Charging method: USB Working temperature: -10 ° C ~ 60 ° C Working principle: Use the principle of cavitation to achieve a quiet and fast stain removal. How to use 1. Place the liner under the stain 2. Drop the drTUI625P of water 3. Repeated cleaning with VITUN ★100% customer satisfaction seice, if you encounter any problems, please contact us, we are always at your seice Precautions: ⊙ When measuring manually, there may be physical errors in the product size. ⊙ Due to the intensity of light, this product will have a certain color difference. This is normal and inevitable. Thank you for your understanding!