Opening the small box (very trivial) I discovered this beautiful object 5 buttons, my hand becomes embedded without problems, very nice everything is well placed. She is really aesthetic. My first instinct was to read the documentation. A summary booklet written entirely in German. I do not know this language but good "after all it is only a mouse" Wireless! But where is therefore the issuer? I complained a second half and went back the mouse. The small USB dongle was plugged into the mouse (relief!). Batteries are supplied. I mainly use Linux and was dreading a possible incompatibility. I plugged the dongle, lit mouse and presto it worked on the fields, no adjustment. It is very precise, very pleasant coating with the contact. I had never had any ergonomic mouse but I conquered. I tested Windows 7 and again it has directly worked. FYI there is an on / off button, and on top of that the mouse is alone in standby mode. The've tested it on various surfaces, table, clothing, tile, white sheet and it works very well. So the have adopted it myself throughout my home and at work.
