The Dingoo A320 is a cool little mini open handheld which is especially good for emulating classic systems such as GBA, NES, Neo-Geo, CPS, Sega etc. It can be thought of as a faster, smaller portable multisystem.

CPU - 400MHz with 32MB RAM & 4GB Internal Storage
D-Pad, 2 shoulder, 4 face, Start & Select buttons, Mic.
Stereo Speakers, Headphone & TV-out w/ included cable
2.8" LCD, 320x240 resolution, 16M colors
Battery - 3.7V 1700mAH, approx. 7 hours run time
Recording - Supports digital recording of voice and radio
Software Support - Free SDK available
Size - 4.92in x 2.17in x 0.59in & Weight - 11.53 oz.
Gameboy Micro form factor
Lightweight
Plays MP4 files including AVI, RM, RMVB and more
Plays MP3 files including MP3, FLAC, and more
Built-in 4GB flash memory storage, built-in mini-SD slot supports up to 8GB SDHC mini-sd card memory expansion (that's 12GB total!)
Cool Text-to-speech ebook reader
Upgradeable system and emulator firmware
Langauges: English, Chinese Simplified and Chinese Traditional

Package includes: Dingoo A320 console, English and Chinese Manual, USB AC Charger, Stereo earphones and AV Out Cable