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 filters
Features like higher frame rates and ray tracing make the PS5 feel truly new-gen (to console gamers at least), while the DualSense is an amazing controller that really enhances games when used well.
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
Logitech 2.4 GHz Digital Cordless for Business features frequency agility. With this technology, the Logitech mouse or keyboard that encounters any interference from another cordless device will automatically identify and switch to a more “quiet” location in the band to transmit data.
Waterproof means that the device is not adversely affected by contact with water and can withstand water contact without becoming damaged.