◆ SONY MDR-DS7100 / mdrds7100 Wireless Cordless Digital Surround Headphone System Sony ◆ m0o9375 ■ Manufacturer/Model Number SONY MDR-DS7100 ■ Included Accessories Instruction manual, stand, AC adapter x 2 (RCA cable and optical cable are not included.) ■ Condition/Maintenance Analog operation confirmed We have performed maintenance and servicing. Each part operates normally. ■ Operation Guarantee Period: 1 month (valid from the date of arrival) * Please be sure to check the guarantee/refund/return policy in the profile. ■ About the product 2.4GHz Enjoy powerful surround sound without worrying about your surroundings. Immersive 7.1ch digital surround headphones ・2.4GHz digital wireless transmission for high-quality sound reproduction ・Excellent sound field with new 7.1ch VRT (Virtualphones Technology) ・Real-time channel selection function automatically avoids power interference from other devices Specifications Type: Sealed dynamic Driver unit: 50mm diameter (CCAW voice coil adopted) Frequency response: 6-25,000Hz Weight: Approximately 325g Inspection/