Guides/Mice·beginner·7 min read

Mouse click switches: mechanical vs optical

What is under the buttons, why some mice start double-clicking after a year, and whether optical switches are worth it.

Under your two main mouse buttons are tiny parts called switches. They decide how a click sounds and feels, how fast it reaches your PC, and how long the mouse lasts before it starts misbehaving. There are two kinds: mechanical and optical. Here is the difference in plain terms.

Mechanical switches

A mechanical switch works with a small metal piece that snaps shut when you press the button, completing a circuit and sending the click. That snap is the click sound you hear.

The catch is that metal parts wear out. Over time the contacts can get dirty or bouncy, and the mouse starts registering two clicks when you only pressed once. This is the famous double-click bug, and it is the main reason a mouse eventually feels broken.

Common mechanical switch brands

Omron D2FC (China-made)
The most common switch for over a decade. A crisp, medium-weight click. Often starts double-clicking sooner than its rating suggests. Found in many older Logitech, Razer, and Glorious mice.
Omron D2F (Japan-made)
A nicer version of the above. Heavier, more deliberate click, and it lasts longer in real use. Found in higher-end mice.
Kailh GM 8.0 / 4.0
A common choice in mid-range mice today. Snappier and lighter than Omron, with less wobble in the button.
Huano Blue / Pink / Black Shell
Used by Endgame Gear, Pulsar, VAXEE, and Wooting. A deep, soft, satisfying click. Blue is heavier, Pink is lighter.
TTC Gold
Used in some Glorious and Lamzu mice. Light and crisp, sitting between Omron and Kailh in feel.

Optical switches

An optical switch uses a beam of light instead of metal contacts. Pressing the button blocks the beam, which triggers the click. Because nothing metal touches, there is nothing to wear out the same way.

  • No double-click bug, since there are no metal contacts to wear or bounce.
  • A slightly faster click, because the light signal cannot bounce and confuse the mouse.
  • A different feel: the click still has a small spring, but some people find it a touch less satisfying than a mechanical snap.
  • Rated for 70 to 100 million clicks, which usually outlasts everything else on the mouse.

Optical switch brands

Razer Optical (Gen 2 / Gen 3)
Razer's own design. Crisp and very fast. Found in the Viper, DeathAdder, and Basilisk lines.
LK Optical (Light Strike)
Used in the Glorious Model O 2 Wireless and Endgame Gear OP1 8K. Light and fast, a little softer than mechanical.
TTC Optical
Common in budget mice like Attack Shark and Aula. Quality varies, but usually good for the price.

Pre-travel and post-travel

These two words describe how far the button moves around the moment it clicks. They are part of why some mice feel crisp and others feel mushy.

Pre-travel
How far the button moves before the click registers. Less is snappier, because there is no wasted motion. Good mice keep it well under 1 mm.
Post-travel
How far the button keeps moving after the click. Less is crisper, so your finger stops right where the click happens.
Side play
How much the button rocks side to side before it presses. Less is better.
Tip
When a mouse is advertised for snappy clicks, it usually means tight pre-travel and post-travel rather than a special switch. The Endgame Gear OP1, Pulsar X2 V2, and Razer Viper V3 Pro all feel especially tight.

Does this affect your aim?

Honestly, barely. A modern mechanical click reaches your PC in about 4 to 8 thousandths of a second, and an optical one in about 1 to 2. That is roughly a single frame of difference on a fast monitor, which you will not notice in normal play. The real reason to care about switches is durability: an optical or premium mechanical mouse is much less likely to start double-clicking a year down the line.

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