Three chamber home, poorly constructed from the right kind of rough hewn cedar, badly beaten up and gouged in multiple places, but for the price, probably beats making one from scratch. I doubt the bats will mind the stapled construction that can easily be pulled apart, because bats are not strong, nor the gouged wood or the somewhat helter-skelter alignment of wooden parts, and as the previous reviewer points out, they're not fussy homemakers, and they'll like how easy it is for them to climb in and out on the rough boards.
You're on your own when it comes to mounting. The package was missing anything that would help with that, such as mounting straps. although there were two loose screws jammed between the boards that could be used for something, I suppose. In the photo, a mounting board is shown on the the back, but this is not included.
The bat house was packed in biodegradable foam "peanuts", which is nice, but would have been nicer if the house had been wrapped in a bag first, instead of just thrown in with the peanuts, because the narrow chambers wound up becoming stuffed with these peanuts in transit, and it was a chore getting them out. I.e., this seller, Real Goods Inv., whatever that stands for, not found on line, is not smart about packing. Even maybe there was supposed to be a mounting board, but they just forgot to put it in the box. Maybe "Inv." is supposed to be "Inc."?
Anyway, assuming you are not put off by the possibility of overpopulation raised by the previous reviewer, I expect this unit will make a happy sleeping quarters for a few of the little critters. In our case, we have mosquitoes and of course various other night bugs, but I doubt enough to support a huge bat population. Also, I mounted the house under the eve on the West side of the house, where it will supposedly be relatively less attractive than if it were on the South side. I don't think they're all that choosey, anyway, because one flew in through an open window one night and acted like it would have been perfectly content living in our house forever.