The V+ Boxes have three video tuners, allowing the user to record two programmes to the hard drive while watching a live programme which can then be paused. V+'s main competitor on the British market, the Sky+ HD box, has two tuners. As with all other digital set-top boxes from Virgin Media. The set-top boxes support 720p and 1080i high definition video via HDMI and component output and is capable of upscaling SD video to HD resolutions. The copying of some programmes may be restricted by using HDCP. The set-top boxes also support Dolby Digital 5.1 surround sound, which is currently broadcast on some HD channels and video on demand (VOD) content. Both set-top boxes support DVB-C transmission using MPEG-2 compression, the standard used by Virgin for both SD and HD video.