Main Features : UV sterilization directly destroys bacterial DNA / RNA molecules, causing bacteria to die or not to multiply. Intelligent shut-off automatically starts sterilization, without any side effects, turn on automatic shutdown sterilization. Full power can be used for 1 months. Support USB charging. Amorphous silicon thin film solar panel. Charge the battery when there is light. Portable and easy to store. Small enough to fit in a bag or suitcase. Support washing. ( Note: Do not splash water into the solar board ) The sterilization rate is as high as 99.9%. Effective sterilization, use sterile tableware care for family health. This UV sterilization box can be adjusted by telescoping to fit different length cutlery. Fit chopsticks length: 13 - 22cm.