The Atari Lynx had several innovative features including it being the first color handheld, a backlit display (and the ablility to switch it on and off), a switchable horizontal and vertical control config, and the ability to attach it to the Atari Jaguar. Later, Nintendo would mimic both the design and the ability to attach it to a conventional console withe the Gameboy Advance.
The Lynx would finally be compltely pushed out with the advent of the Sega Game Gear, which copied a few of the Lynx's features. By the early 1990's, the Atari Lynx had faded away.
Specs:
CPU(s): "Mikey" - 16 bit CMOS chip @ 16Mhz, 65C02 @ up to 4Mhz
"Suzy" - 16 bit CMOS chip @ 16Mhz
Graphics: 4096 color palette, 16 simultaneous, 160x102 standard resolution, 480x102 artificial resolution
Audio Processor: 4 channel, 8-bit DAC, handled by "Mikey"
RAM: 64K
Storage: Cartridge - 128 or 256K