name a few electronic parts of this product.
The CPU is a Motorola 68000 processor,a Backup RAM cartridge, RCA pin jacks, etc.
Sega CD
The main CPU of the Sega CD is a 12.5MHz 16-bit Motorola 68000 processor, which runs 5 MHz faster than the Genesis processor. It contains 1 Mbit of boot ROM, allocated for the CD game BIOS, CD player software, and compatibility with CD+G discs. 6 Mbit of RAM are allocated to data for programs, pictures, and sounds; 512 Kbit to PCM waveform memory; 128 Kbit to CD-ROM data cache memory; and an additional 64 Kbit are allocated as the backup memory. Additional backup memory in the form of a 1 Mbit Backup RAM Cartridge was also available as a separate purchase, released near the end of the system's life. Audio can be supplied through the Ricoh RF5C164, and two RCA pin jacks allow the Sega CD to output stereophonic sound separate from the Genesis. Combining stereo sound from a Genesis to either version of the Sega CD requires a cable between the Genesis's headphone jack and an input jack on the back of the CD unit. This is not required for the second model of the Genesis.
what is 'sega cd'? A  CD-ROM accessory for the Mega Drive/Genesis . which company manufactured them? Sega.
wiki:19607349
Sega CD [SEP] Technical specifications
The Sega CD can only be used in conjunction with a Genesis system, attaching through an expansion slot on the side of the main console. It requires its own power supply. In addition to playing its own library of games in CD-ROM format, the Sega CD can also play compact discs and karaoke CD+G discs, and can be used in conjunction with the 32X to play 32-bit games that use both add-ons. The second model, also known as the Sega CD 2, includes a steel joining plate to be screwed into the bottom of the Genesis and extension spacer to work with the original Genesis model.