HOMERS mask air fan with a 400mAh battery, charging cable, and storage bag. - Brand: HOMERS - Included: Charging cable - Storage bag: Included - Battery capacity: 400mAh - Output voltage: DC 5V / 1A Thank you for viewing. The above description was generated by AI. This is a handy fan for masks. It has been tested and confirmed to work, so it is listed as "like new," but it has not been used. The box and instruction manual are not included. Press and hold to turn the power on and off, and briefly press to adjust the strength. A lamp lights up during operation. I tried pressing the button several times, and I was able to make the lamp blink, but I don't think it can be turned off. It will be shipped via Yu-Packet Post Mini envelope and dropped off at the post.