Built-in 1200mAh long battery life, built-in powerful lithium battery, you can easily charge via USB, carry it with you, and use it in different places. The size is 10.5*3.9 (cm). Compared with the traditional air purification bag, it will take less maintenance or cleaning time. It allows your refrigerator to maintain a clean smell without the need to clean the filter or change the absorption bag. The noise is about 30dB during operation, which is very quiet, so you can use it without being distracted. It can absorb oxygen molecules in the air, keep food fresh and prolong the storage time. Our refrigerator deodorizer has passed the most stringent safety standard certification. If you encounter problems during use, please feel free to contact us via e-mail, and we will help you at any time.