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USB wall sockets output: • Low-voltage direct current (DC) • Voltage is internally converted and regulated • Can be directly supplied to electronic devices. Therefore, the USB wall socket itself performs the power conversion task originally done by the adapter.

Under normal circumstances: The USB interface itself does not pose a risk of electric shock. The real concern is not the USB output end, but rather: Whether the high-voltage to low-voltage conversion process inside the wall socket is safe and reliable.