What exactly do I have here? Sig p228 with build in laser

[izzy]

My father in law gave me a pistol and I'm having trouble figuring exactly what it is. I've did a bunch of googling but can't find anything like it. It's a sig P228 with a laser built into the slide. There are no batteries in it so I'm not sure how it works, batteries are on order. I'm not really into lasers on pistols, or in general but I'll check it out when the batteries arrive. I'm curious what I have on my hands though. There are what look like copper connectors at the top of the frame that connect to similar connectors on the slide. The front of the slide has a laser built into it. Any info on this pistol would be appreciated.