The unibody model debuted in October 2008 in 13- and 15-inch variants, with a 17-inch variant added in January 2009. Called the "unibody" model because its case was machined from a single piece of aluminum
Air Coolers
Air cooling is a method of dissipating heat. It works by expanding the surface area or increasing the flow of air over the object to be cooled, or both. An example of the former is to add cooling fins to the surface of the object, either by making them integral or by attaching them tightly to the object's surface.
Active Noise Cancelling (ANC) continuously blocks unwanted external noise. Switch to Transparency mode when you need to hear the world around you. External-facing microphones allow the sounds of your surroundings back in for a natural listening experience
The switches used in Logitech Silent Mice are made of a rubber actuator that dampens both the vibration and the sound. A red plastic cap covers the rubber actuator to improve the switch's tactile feedback and lengthen its lifespan.
Your speaker is waterproof, splash resistant, and dust proof. It is rated IP67 and IP64. You can immerse the speaker in water for up to 30 minutes at a depth of up to 3.3 ft (1 m). It can also be used while showering and in the rain or snow.