Charging a ZipIt Z2 off USB

I love my little ZipIt Z2.  I don't always make room for it in my bag, and it was annoying me to cart around yet another adapter.  Taking a look at the back of the adapter, though ... five volts, you say?  1.2 Amps?  That sounds a lot like what USB provides!

And it turns out it works.  I chopped the barrel connector off the one end, and cannibalized one of the million USB cables I've accumulated in my life.  Twist them together to test -- solder them once I've got the polarity right -- and I'm all set.  Now it can travel with me, with one less accessory.