How to use Liftmaster garage door IR safety sensors for other uses?

["Bob F" <bobnospam@xxxxxxxxx>]

I picked up a couple pairs of these Liftmaster 41A5034 garage door safety
sensors, which I thought I might be able to use for other sensing on my homebrew
home control system. Does anyone know what voltage/current the sender needs, and
what connections the 2 wire detector needs and how it signals. They both have
white 2 conductor wire with a black line on one of the conductors.