backward compatible with all previous hdmi standards hdmi head: skidproof gold-plated plug head wire: silver coated copper wire inside to reduce interference. cable cover: 4 layers shielding, high-precision standard polyethylene insulating material fully hdcp compliant to provide highest level of signal quality supports uncompressed audio/video signals for lcd,dvd,hdtv,hdtv receiving box, etc. supports multiple audio formats, from stereo to multi-channel sound. perfect for both high-definition video and standard video formats shielded for maximum protection from rfi and emi interference. support 720o and 1080p true hd resolution. length: 1m/1.5m/3.m/5m/10m/15m.