This product is either discontinued or we cannot get that from suppliers.
Battery life: Up to 20 hour battery life, Battery type: Rechargeable lithium-polymer, Charge Time: 3 hours, Frequency Response: 10Hz–40,000Hz, Sensitivity: 100dBSPL/mW at 1kHz, Wireless Type: Bluetooth, Warranty: 02 Years, 4P5K9AA.