Sony MDR-HW700 Wireless Digital Surround Headphone for MDR-HW700DS (Japan Import)

Accessories: None. Battery life time: 12 hours Weight: about 320g. Charging time: 3 hours Charging Method: USB charge. Impedance: 24Ω Power supply: Built-in Li-ion rechargeable battery (DC3.7V). Driver unit: φ50mm Playback frequency: 5Hz-25, 000Hz.
MDR-HW700DS expansion wireless stereo headphones