The usage time is about 30 hours, and I have confirmed that it works without any problems before listing. The rubber band and cushion board were used when stacking with the amplifier, so they show signs of use. The band and cable in the box in the fourth photo are unused. The charging cable can also be used without any problems. Please consider this item if you understand that it is a product from 10 years ago. If you purchase it as a set with the portable amplifier listed separately, I will include the connection cable shown in the eighth photo. - Brand: Cypher Labs - Model Name: AlgoRhythm Solo -R - Output Terminals: Line Out - Connection Terminals: USB, Coaxial - Country of Manufacture: Made in USA Thank you for viewing.