USB powered DACsprices on 81 model
From USB port— in this case, we mean power from the same connector with which the device is connected to external equipment. This can be either USB itself or another interface — for example, FireWire (in some computers and specialized equipment) or 8-Pin Lightning (in Apple portable devices). Such power allows you to do without unnecessary wires and work independently of sockets, but its power is low, so this option is used only in compact devices, often portable ones.
USB power in some models is combined with a built-in battery, and in some it complements mains power, being a backup option in case there are no outlets.
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