4; 8 or 16 Channel DVR., Easy on screen set up., Up to 33 days recording., Easily transfer recordings with supplied USB (Universal Serial Bus) stick or by DVD., See images remotely on PC; mobile phone or iPad., Continuous or motion triggered recording., 4 channel DVRs complete with 500GB HD., 8 & 16 channel DVRs complete with 1TB HD., 1 Year guarantee.