CD and Sega 32X add-ons. Sales estimates for the 32X stood at 665,000 units at the end of 1994. Despite assurances from Sega that many games would be developed for the system, in early 1996, Sega finally conceded that it had promised too much out of the add-on and decided to discontinue the 32X in order to focus on the Saturn. In September 1995, the retail price for the 32X dropped to $99, and later the remaining inventory was cleared out of stores at $19.95, with 800,000 units sold in total. Sega Neptune The Sega Neptune is an unproduced two-in-one Genesis and 32X console which Sega planned to release in fall 1995, with the retail price planned to be something less than US$200. It was featured as early as March 1995, with Sega Magazine saying the console "shows [Sega's] commitment to the hardware", and that the system would be compatible with the Mega-CD. Sega cancelled the Neptune in October 1995, citing fears that it would dilute their marketing for the Saturn while being priced too close to the Saturn to be a viable competitor. Electronic Gaming Monthly used the Sega Neptune as an April Fools' Day prank in its April 2001 issue. The issue included a small article in which the writers announced that Sega had found a warehouse full of old Sega Neptunes, and were selling them on a website for $199. Technical aspects and specifications The 32X can be used only in conjunction with a Genesis system. It is inserted into the system like a standard game cartridge. The add-on requires its own separate power supply, a connection cable linking it to the Genesis, and an additional conversion cable for the original model of the Genesis. As well as playing its own library of cartridges, the 32X is backwards-compatible with Genesis games, and can also be used in conjunction with the Sega CD to play games that use both add-ons. The 32X also came with a spacer so it would fit properly with the second model of the Genesis; an optional spacer was offered for use with the Sega Genesis CDX system, but ultimately never shipped due to risks of electric shock when the 32X and CDX were connected. Installation of the 32X also requires the insertion of two included electromagnetic shield plates into the Genesis' cartridge slot. Seated on top of a Genesis, the 32X measures .