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The bottom panel is quite typical for a Razer mouse. It stands on Teflon feet and has a sticker with logos, serial number and technical information such as compliance with industry standards. The sensor is placed in the center and accompanied with a sticker that says “3G Laser Sensor. Precision 4000 dpi.” Like on the Copperhead, there is a button to switch the settings profiles stored in the device’s memory. It is placed in a depression but is easy to press with your finger. When you press it, the mouse blinks its highlighting to inform you about the active profile number (1 blink for the first profile, 2 blinks for the second profile and so on up to 5 blinks).

The two ultra-slick Teflon feet have remained in all mice from Razer since the original Boomslang: two L-shaped feet at the front and one long foot at the back. This element is too perfect to need an improvement. I guess the feet of Razer’s mice are most universal, quiet and sleek among all that mouse manufacturers use. Razer’s mice can be utilized without special stickers even on metallic and glass gaming pads such as Icemat, Corepad and BansheePad. You shouldn’t do that for a long time, however. Such pad materials are not good for the mouse’s feet. The Lachesis behaves superbly on fabric or plastic. I tested it on a Roccat Sense, X-Trac Ripper, Razer eXactMat and even on a couple of no-name vinyl pads and the mouse ran smoothly on each of them. In fact, the Lachesis doesn’t have a “favorite” surface. You can choose whatever pad you like while the mouse will readily work even on your naked knee!

The sides are designed well even in comparison with the Copperhead. The deep and properly placed grooves for fingers on both sides made the rubberized edging of the perimeter unnecessary. This edging used to help to hold the mouse in the air. It is easy to hold the Lachesis with the fingers as well as in the palm. In the latter case the palm is holding the back of the case and three fingers (the thumb, the ring finger and the little finger) are holding it at the front – you press the very edges of the buttons. And if you prefer to hold the mouse with your fingers only, you can put your thumb and ring finger into the side grooves and press the buttons near the wheel. The mouse’s long buttons respond equally well irrespective of the exact position of your press. Their exclusive wavy shape is comfortable for the fingers. The main buttons have the same movement distance as with any other mouse, but the sound of a click is softer. The buttons do not rattle, of course.

There is one aspect of mouse-making that Razer has not been very good at. I mean the side buttons. Of all the designs, the DeathAdder seems to have been the only proper solution in this respect, yet it was somewhat worse than the competing products, too. The Lachesis has two buttons on each side (it thus has a total of 9 programmable buttons). They are placed right above the finger grooves and are hard to press accidentally. The buttons are very stiff and have a movement distance of 2-3 millimeters. As a result, if you are pressing a side button with your thumb, you have to press on the mouse from the other side with your ring and little fingers. The button just won’t sink down otherwise. The two buttons on the right side are virtually unusable at all. It was hard to press them on the Diamondback, and it is just impossible to press them on the Lachesis. It is especially surprising considering the DeathAdder’s design.

The last element of the Lachesis is its USB interface cord. It is 210 centimeters long (about 7 feet), slim and light, and ends in a gold-plated USB connector with a Razer logo. The hole for the cord in the case is placed quite far from the mouse’s bottom panel. It is another traditional feature, designed for user’s convenience, since the Boomslang.

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