Mattel's Basketball Keychain (2001, LCD, 2 Watch Batteries, Model# 07802)
This is a keychain version of Mattel's original LED Basketballl game from 1978. It's about 2 inches tall by 1.5 inches wide, and is fully functional. It has a display like a normal LCD game, but the blips are red. It's actually manufactured by a company called Fun 4 All (www.fun-4-all.com). (Fun 4 All has released 4 of Mattel's classic games in keychain form: Basketball, Football, Hockey and Soccer.)
Collector warning: This does have 2 batteries included in the game (at least it's turned off), and there's no way to open the package without destroying it...
Do I have this? Yes, new.