Manufacturer: SONY Product Name: Wireless Stereo Headphones Model Number: MDR-XB650BT Body only. Type: Over-ear Connection Type: Wireless Driver Size: 30mm Bluetooth Version: Ver.4.0/Class2 Continuous Playback Time: Up to 30 hours Charging Time: Approximately 4 hours Operation has been confirmed and it works normally. Usage frequency is low, and I think there is still a considerable amount of battery life remaining. The condition is good, but there are some small scratches on the outside. Please refrain from purchasing if you are sensitive to such imperfections.