AKG Fully Digital wireless Surround Headphone System with Dolby Digital Decoder - HEARO999AUDIOSPHEREII Intergraded Dolby Surround Pro-Logic and Dolby Digital decoders, IVA and VMAx Six individually selectable ear matching curves 24-bit digital radio transmission using digital antenna diversity receiver ensure noise-free reception without drop-outs Includes 2 AAA NiMh rechargeable batteries, charger, ear pads, analog/digital input cables &amp; aluminum carrying case