Sony MDR-RF865RK

40mm driver unit, 25 hour battery life, Noise reduction, Analogue 2 input, 100m transmission range Noise cancelling. Listen without wires up to 100m range<br/>
<br/>100m range: Wireless high quality closed type headphones, with up to 100m reception range.<br/>
Noise reduction system: Reproduces a clearer sound and reduces distracting ambient sounds, so all you can hear is the music.<br/>
40mm driver unit: Delivers a wide frequency range and broader dynamic range, to reproduce accurate sound.<br/>
Automatic tuning: Enjoy the highest quality signal transmission, with automatic tuning built-in.<br/>
Battery life: Listen for longer with up to 25 hours battery life, and automatically charge via the secure stand.<br/>
Ease of Use: Adjust volume levels quickly and easily via controls built-in to your headphones.<br/>