This is an auction for the case only! Thank you for viewing! I run a battery replacement business in Hiroshima! I am Chika, a repair and electrical shop (*^^*) This is a new battery that I replaced (*^^*) I will also include a warranty, so you can rest assured (*^^*) I offer a free one-week warranty, so please feel at ease (*^^*) Extended long-term warranties are also available, so please feel free to contact me (*^^*) I also accept repair requests, so please feel free to consult with me (*^^*) I appreciate your kind words! Thanks to you, we've had a great response, and we're about to run out of stock! We recommend that those who are planning to purchase do so as soon as possible (*^^*) Wireless Noise Canceling Stereo Headset WF-1000XM4 Brand: SONY Wireless Noise Canceling Stereo Headset WF-1000XM4 Brand: SONY Wearing style: Separate left and right, completely independent Earphone/Headphone type: Canal type Structure: Sealed type Wireless/Wired connection: Wireless Earphone/Headphone functions: Noise canceling, Hi-Res, Microphone, External sound capture, Waterproof, splash-proof, Remote control Low-frequency range (Hz): 20 Hz High-frequency range (kHz): 40 kHz Wireless standard: Bluetooth Wireless function: Multi-pairing Bluetooth codec: LDAC AAC SBC IP standard (waterproof standard): IPX4 Drive system: Dynamic type Driver size (mm): 6 mm Charging terminal: USB Type-C Charging time: 1.5 hours Weight (g): 14.6 g