Sony MDR-RF4000K headphone

40mm driver, closed type, smart store & charge dock, 30m range, AC adaptor, rechargeable batteries Digital sound quality headphones with smart store & charge dock<br/>
Listen at high volume without waking anyone<br/>
Enjoy total freedom with 30m range<br/>
Stylish store and charge dock fits in the TV rack<br/>
<br/><br/>40mm driver: Hi-Fi quality digital sound for home, with powerful 40mm Neodymium driver unit and long stroke diaphragm for deep clear bass.<br/>
Digital RF: Digital Radio Frequency transmission technology with no interference and 30m listening range.<br/>
Cordless style: Closed type headphones with wireless connectivity and built-in volume control for the ultimate freedom to listen around the house.<br/>
Easy set up: Tune and go: Automatic tuning and on/off switch, plus comes with all the cables you need to plug into your TV.<br/>
Smart charging: Stylish new charge and store dock matches any TV design: Headphones swivel flat and slide into case for easy recharging.<br/>
Lightweight and long-lasting comfort: Weighing just 220g and designed for long-lasting wearing comfort with parallel-link self-adjusting headband plus padded circum-aural ear cushions.<br/>
Long battery life: Battery playback time of up to 28 hrs with AAA Alkaline battery - 13 hrs with rechargeable NihM battery.<br/>