Sony Wireless Bluetooth with Headphones, Compatible, Foldable, Microphone, MDR-ZX330BT

Type: Sealed, Dynamic Driver unit: 30mm Magnet: Ferrite Power source: Built-in rechargeable lithium-ion battery Charging time: Approximately 4 hours Charging method: USB charging Method: Electric capacitor Directional characteristics: omnidirectional Effective frequency band: 100 Hz - 4,000 Hz Maximum communication range: line of sight approximately 10m