NOT AN ANSWER: i mean like when you plug earphones in like a computer that has speakers, the sound only works in the earphones. but i want a device that plugs in and has no wires just a stick sort of thing? PLEASE CLICK IMPROVE ANSWER AS THIS IS A QUESTION DESCRIPTION!
They are called "noise-canceling headphones", and the technology is called "active noise-canceling"
It could actually block sound better, because it is actually closing off your ear canal, as opposed to just covering your ear well, as some of the other headphones do.
You can't because moderators block that feature
it is a device to lift heavvy objects
A complaint to the police will do it. Or a complaint to the building managers if you are in an apartment.
In every Unix-like operating systems device files are used as interface to device drivers. Every device is represented in file system with a special file, these special files are called as Device Files. There are two standard types of device files: character special and block special. Character special files are used to interface character devices. Character devices transfer data in terms of character. Example of character devices mice, serial modems. Block special files are used to interface block devices. Block devices transfer data interms of blocks. Example of block devices hard disks, CD-ROMs.
Add a password.
don't no but i wish i had one
firewall
Block is a generic OS concept. Whenever OS wants to read data from the hard disk, file system tries to read a block of data instead of one character at a time. This improves the performance. (disk is a mechanical device) Size of the block varies for each file system, user can specify the block size when a file system is created on the device. Creating a file system on Linux is equivalent to formating a device on Windows. When you format a device on windows you can specify the block size. To create a file system on Linux mkfs command is used. The default block size is 4K but this can be modified with -b option. For eg. $ mkfs -t ext2 -b 2048 /dev/sdb1 this command will create ext2 file system on the device with block size 2048. There is a limitation imposed on maximum size of block by ex2/3/4 file system. Maximum block size should be 4K and minimum is 512 bytes.
A block special file that provides access to a device that transfers in groups of a fixed size. For example, a disk. A character special file that provides access to a device that transfers in increments of a single character; for example, a terminal.
Noise cancelling headphones uses a microphone near to the ear to generate and anti noise which is then mixed with the main sound. This anti noise cancels out the noise by using the phenomenon of destructive interference. Therefore, the final sound from a noise cancelling headphone is crisper in comparison to its counterpart the noise isolating earbuds which try to block the noises by using some sort of cushions.