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
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.
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.
Jack or analogue cinch cables already provide the amplified sound signal. Via USB, so-called frames or data packets are transferred from the hard disk to the USB sound card and then converted and amplified in the speaker.
With a wireless security camera, the video signal—and, with some, the audio signal as well—transmits over the internet or other wireless network to a receiver that connects to your viewing and recording device.