ASUS MS-71 Ultra-Mini Wireless Mouse

As featured in 7 Gadgets -

ASUS has released the 800 dpi ASUS MS-71 Ultra-Mini Wireless Mouse, "the world’s smallest 2.4GHz wireless mouse" at only 65.8mm (L), 25.1mm (W) and 17.5mm (H).

Get more details and complete specifications here.