content: See the reviews for the AUA-1422 - a similar item with one extra 1394 port. Adaptec has some crazy requirements for a power supply (12V, 2.1A), and used to offer one that fit them through their store, but apparently no longer do! Without the adapter, this unit is only usable for items that draw almost no power through the USB or 1394 connection - which is a shame, because the Adaptec 1394 implementation was always the most stable on my machines. Look for one that includes an AC adapter or some other way of bringing power to the unit instead.