SONY Wireless Noise Canceling Stereo Headset MDR-EX31BN Operation confirmed. There is a feeling of use, so please check the photos. *Please note that this is a long-term storage item, so battery deterioration is also possible. Please purchase only if you understand that this is a used item for personal use. - Brand: SONY - Color: Black - Noise Control: Active Noise Canceling ・Type: Sealed dynamic ・Driver unit: Approximately 13.5mm ・Weight: Approximately 34g ・Power supply: Lithium-ion rechargeable battery (built-in) ・Charging time: Approximately 2.5 hours ・Type: Electret condenser type ・Directivity: Omnidirectional ・Noise canceling function: Yes Included: Genuine earphones (45cm) Charging USB cable