Using Sandberg BT Link For 2xHeadphone, you can wirelessly connect 1 or 2 headphones to an audio source such as a TV or computer. Sandberg BT Link For 2xHeadphone simply connects to a MiniJack headphone output and then wirelessly sends the audio signal via Bluetooth. Sandberg BT Link For 2xHeadphone is powered directly via USB. Up to 6 hours of battery life when USB is not connected. Two headphones of the same type can be connected, to enable two people to see the same film with wireless headphones without bothering anyone else in vicinity. Perfect for long flights, on trains, at school or in the office.