Premium foldable wireless headphones with integrated Bluetooth Technology Designed with hands free capability and built-in microphone ; Stand-by time: 500h ; Play time: 12h ; Bluetooth: 4.1 Comfortable memory foam ear pads and headband for easy listening. Includes noise cancelling feature for immersive audio Ear cups can be swivelled horizontally and vertically to find the perfect fit. Sensitivity- 97dB±3dB At 1KHz These headphones are sturdy TR90 and have a practical folding function that saves room and makes them easy to pack.