ColecoVision is a home console released by Coleco in 1982. The main competitor of ColecoVision was the less commercially successful Atari 5200. ColecoVision, having Nintendo's famous Donkey Kong as the packaged-in game and with smoother graphics is estimated to had more than 2 millions sales. However, the sales dropped after the 1983's crash of the gaming industry and discontinued in 1985.
ColecoVision came in a 14x8x2 inch plastic case that houses the motherboard with a cartridge slot on top and the connectors for the power supply and the RF jack on the back. ColecoVision came also with two controllers, allowing two players game mode. The design of the controllers was similar to an old telephone. The controllers themselves had a key pad, side buttons and a joystick, while the keypad could be used with theme plastic overlays that mapped the keys to a particular game. ColecoVision had 1KB of RAM, 256X192 resolution, could process up to 32 sprites on screen at once and displayed 16 colors in total.
The most interesting ability of the ColecoVision was the expansion module input at the front of the unit, which gave to ColecoVision the ability to use different pieces of hardware. There were three expansion modules. The first expansion module, Expansion Module #1, allowed you to play Atari 2600 games, the second was a driving controller and the third was a fully fledged computer known as the Adam.
There are also many commercial videos of ColecoVision on the Internet. You can have a taste below: