yep, just connect straight to 12v
I thought the same thing, they're a bit too cheap.... but the 8 I have up are working great, they're not normally on much, but I left them on overnight the first night I put them up to test them a bit... all still perfect in the morning :-)
plus, cheap enough to replace if they go wrong
they used to combine postage, deffo. did the first time I ordered :-(