Unplugged (adjective)

1. Not connected to a power source or the internet.
2. Performed without the use of electronic amplification or effects.

Origin:

Late 20th century: from un- (expressing negation) + plugged.

Examples:

1. The computer is unplugged.
2. The guitar was unplugged.
3. The phone is unplugged.
4. The concert was an unplugged performance.
5. The device is unplugged.