It's a mouse. It's $15. It's not really geeky, but I guess Linux fanatics might want to gift it to their kids. Stats below.
Mouse Structure: Optical
2-button mouse with scroll wheel.
Ergonomic design, comfortable control.
Latest optical tracking engine for pinpoint accuracy.
Optical sensor stays precise on the most surface without mouse pad
Support Windows XP, ME, 2000, 98SE or Mac OS.
Dimension: 9.2 x 8.0 x 3.0cm
Cable length: 140cm
Color: Black, Pink, Blue
Cost is $15. [USB Geek]