It's the TCD652160 (i.e. regular TivoHD, not the THX Series 3), but with an upgraded WD 500GB hard drive, so you can record 75 HD hours. It's been a great workhorse, with its only flaw the common HDMI port stopped working a few years ago. Everything else about it works great. Looking for $100, plus you pay whatever shipping you want me to send it with.