Game Gear with Sega's TV tuner attachment.
CPU: Zilog Z80 @ 3.58 MHz
Display: 160 x 144, 32 colours out of 4,096. 64 sprites. 3.2 inch LCD screen.
Sound: 3 square wave generators, 1 noise generator. Stereo only through headphones.
Memory: 8K RAM, 16K VRAM.
Software Media: Cartridge.
Value: £20 - £35 depending on bundled games.
Be careful to check that the sound works, as this is a common fault.