Active noise cancelling headphones with luxury, adjustable cushioning headband and earpieces. Foldable for easy portability. Hands-free phone call function with built-in microphone. Listen to music wirelessly for up to 10 metres. Supplied in zippered EVA case. Battery Type: Rechargeable 250mAh Lithium-ion. Frequency Response: 2.40GHz~2.48GHz. Charge Time: 1 hour, Standby Time: 10 hours. 12-month limited technology warranty.