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Exterior Design, Ergonomics and Operation

Except for the unusual Boomslang (both new and old), every new product from Razer can be easily identified as developed by it. In fact, Razer has one basic shape of a mouse that is being steadily optimized and modified for the current requirements. This characteristic ergonomic design appeared in the first modern model of the Viper, improved in the Diamondback, and then passed on to the Copperhead and Krait. As for the source of the original inspiration of Razer engineers, it must have been classic ball models from Logitech (the Logitech MX300 is the most recent model to have a similar design). The key elements are as follows: symmetry, an egg-shaped profile, a high ratio of length to width. Razer has managed to bring this shape to the point of perfection, making it as handy as possible. A special feature from the Boomslang times, the main buttons are huge, almost half the device’s length, with a tricky wavy profile. The mouse has become higher in the middle to lie snugly in the palm. There are grooves for your fingers in the sides, so this design is not altogether non-ergonomic. The Viper, Diamondback, Krait and Copperhead have all been made by this recipe. In fact, they are all revisions of the same design. Released in the last year, the DeathAdder seemed to bear no semblance to the previous products but actually represented the traditional shape of the Razer mouse adapted for right-handed people. Two aesthetic elements were added in the DeathAdder: a new dull black material of the surface and the fusion of the exterior plastic of the buttons with the case.

Why am I so detailed about that? Because, like with all other products from Razer, it is easy to track the evolution trend that has given birth to the Lachesis. It is visually a DeathAdder that has been stretched out to the traditional symmetric shape and has acquired a few more buttons. The dimensions are almost the same, the new model being but 1 millimeter longer and wider than the DeathAdder. An interesting trait has appeared: the two main buttons are wider than the rest of the case, making the Lachesis look like the Boomslang rather than the Diamondback and others. The mouse is small overall. Perhaps it won’t seem handy for people with large palms but they can use the Boomslang 2007 CE instead.

The top surface, except for the two small buttons, has a matte black rubberized coating. Unfortunately, this surface quickly gets greasy even if your hands don’t sweat much. The bottom part of the case is made from glossy black plastic. Thanks to its good ergonomics properties the mouse can be easily held in the air (the side grooves prevent it from slipping out of your fingers). I guess it would be better if the whole case were made from this plastic.

A laser sensor doesn’t need highlighting. The LED-based illumination serves aesthetic purposes only. The Lachesis comes in three varieties: Phantom White, Banshee Blue and Wraith Red. I’ve got the third version, with red highlighting. One LED is located near the scrolling wheel. The other is pulsating and highlighting the Razer logo at the back of the case. By the way, it is the first time Razer provides a white-highlighted version which looks very stylish.

The scrolling wheel has Razer’s traditional shape, diameter, width and material (translucent white rubber). There are cross notches on it for a better grip with the fingers. The notches are few but deep. The wheel’s response feels sharp, every notch (24 in total) clicking perceptibly. Fast scrolling is not quite convenient as you have to overcome the resistance of the wheel, but you can switch weapons in games comfortably – you won’t miss the weapon you need. The mouse doesn’t support horizontal scrolling.

Above the wheel and closer to the middle of the case, there are two additional buttons. It is the first time a Razer mouse has them. By default, they change the resolution of the sensor, but you can redefine them using the driver. I guess it is better than the common practice of dedicating one or two special buttons to change the resolution (without the option of redefining). The buttons are handy. Although small, they are stiffer than the main ones. So if you need more than two buttons in your game, you may want to use these additional buttons considering the problems with the side ones that I’ll describe below.

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