No, it's not a wired mouse. This mouse works wirelessly using a 2.4 GHz connection with a USB receiver, offering a wireless range of up to 10 metres and a battery life of around 12 months on an AA battery. It combines the reliability of a wired mouse with the freedom of wireless.
The measurements are obviously related to the first picture. So height = measured from the back to the front of the mouse, width = measured from left to right, length = the depth seen from above.
It's a bit misleading but still understandable. Here are the dimensions as it probably makes sense to you: L = 97.7mm, W = 61.5 mm, H = 35.2mm