Just got it today, but here's a few quick pictures and descriptions, I'll write more later.
There's the system with three games. I put the NES game next to it to give a sense of the tiny size of the system. You basically hold the system steady with the handle on the left and use the handle on the right. It works just like a joystick, you can't rotate it or anything. The start button/ b button is on the handle and the a button is on the side of the joystick. Every game I've played only uses the a button. There's also a pause button by the power switch, which is nice.
As you can (hopefully) see from this blurry picture, the Frogger game is licensed by Konami.
Excite Invader is just a simple Space Invaders clone, except sideways.
Robotan Wars is a pretty decent Robotron clone. You're the little guy in the middle.