Hi try this link.
It does not give you a lot of info, in fact it doesn't present it in a logical fashion, but you should be able to dig out of it what you need.
- connect +5V to the + pin
- connect gnd or neg to the -pin
- the output will come out of the center pin
It is a bit ambiguous when it comes to describing its output.
This device will give an output around 2.5V with no magnetic field near it.
Output will go to 0V or up to 5V when a magnet north or south pole is bought close to it.
Elsewhere it states 0V for no magnetic field, but I think this is wrong.