Weight of the handy mouse with two AAA batteries even 72 grams. She let herself be easy pairing, has a switch and a quite bright red sensor on the underside. Ergonomic no objections, it can be right and left equally good use and functioning properly. Unfortunately not the remaining battery power is displayed by hardware. The operating instructions are no explanatory notes on the nature of the "three-step" energy-saving measures or how or if low battery voltage is displayed. I can not say anything about the battery life. All in all I am satisfied so far with the mouse.
Addendum 22.10.2014: The scroll wheel is too shallow for an extended safe operation and smooth, still ok.