Charge bluetooth using USB not AC wall charger?

Hi, I bought a cheapo bluetooth, it is a "bluedio T9", and I was going to use it but I realized that the AC charger was not the north american type, on the european and asian type!

So here's my question, if I get a usb cable with the correct "round plug" on the end, will my bluetooth charge at all, or blow up? (The end that plugs into the bluetooth appears to be a little more than 1mm diameter)

Here are the specs on the AC wall charger:
Input: 100-240V
50-60Hz, 125mA
Output: DC 50V @ 150mA

And of the bluetooth itself:
Operating current: <= 25mA
Standby current: 40 microamps
Operating Voltage: 3.6V
Class 2, 2.4-2.4825Ghz

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As long as you stick to the specs listed above, you should be fine.