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Adapters (sometimes called dongles) allow connecting a peripheral device with one plug to a different jack on the computer. They are often used to connect modern devices to a legacy port on an old system, or legacy devices to a modern port. Such adapters may be entirely passive, or contain active circuitry. A common type is a USB adapter.
The increasing need for international travelers to use their laptops as well as access the internet created a demand for electrical adapters, converters, and telephone adapters. While today most electronics are dual voltage 100-240V and capable of handling electricity worldwide, previously many of them needed a voltage converter.
The throughput of each USB port is determined by the slower speed of either the USB port or the USB device connected to the port. High-speed USB 2.0 hubs contain devices called transaction translators that convert between high-speed USB 2.0 buses and full and low speed buses. There may be one translator per hub or per port.
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The Game Boy Advance SP Headphone Adapter allows headphones with a 3.5mm phone connector to be used on the Game Boy Advance SP. The SP lacks a standard headphone jack, so it requires the use of special headphones or an adapter for headphone functionality. This adapter connects into the "Input 2" port of the SP.
Juice jacking is not possible if a device is charged via a trusted AC adapter or battery backup device, or if using a USB cable with only power wires. For USB cables with data wires, a USB data blocker (sometimes called a USB condom) [25] can be connected between device and charging port to disallow a data connection. [26]