No more than 500mA
Anyone know how much current one these USB bluetooth dongles draw?
Way less than that- I don't know what chip is in that device, but for example, the BCM2045 uses 50-60ma when active, according to the spec.
The chip I found is not likely to be the one in your device, but the power draw should be similar.
Zotac H55-ITX w/ 802.11n WiFi, i3-550/3.20GHz, 8GB DDR3 1333MHz, 120G Intel SSD, P2140,
7" pseudo-transflective resistive TS, Win7-64, Centrafuse 4.3, Elmscan Compact 6, BU-353, Rear camera, Trailer camera